As Bill noted, the aluminum segment has a significant role in our overall profitability. In 2021, the average elemi aluminum price surged to its highest level in more than a decade, and pricing today is higher than the average levels we experienced in 2021. On the supply side, important fundamentals have taken shape in China, which is the world's largest producer of aluminum. In 2021, the country curtailed more than 2 million tons of annualized capacity due to both power shortages, and the enforcement of policies related to energy and the environment. These supply dynamics are not only occurring in China, increases in market power prices in Europe have led to a series of smelter cuts there that I will discuss in more detail in the next slide. On the demand side, we expect annual global demand for primary aluminum to increase this year between 2% and 3% relative to 2021. Demand in 2021 had already eclipsed the pre pandemic levels of 2019. We continue to see positive GDP and industrial production across most of the world's leading economies, which supports continued annualized growth in aluminum demand across all major end use sectors. Aluminum prices have been supported by supply constraints, low inventory levels and high transportation costs. From a commercial perspective, the shortages of some specific alloying materials key to our value added products have also eased somewhat from the tightest points in the fourth quarter. On sales, much of our volume for value adds aluminum products are sold in annual contracts, and negotiations with customers resulted in favorable pricing. We expect higher premiums relative to 2021 and continued demand for any remaining open volume. We continue to benefit from our position as a domestic supplier to the deficit markets in North America and Europe, where regional premiums remain high. On overall market dynamics, the factors supporting higher aluminum prices represent fundamental structural changes that we believe will remain in place over the next decade, supported by a drive towards more sustainable solutions. The global push to reduce carbon emissions is a boon for aluminum demand at a time when supply constraints are becoming more prevalent, particularly in China. With policy goals that target reductions in total carbon emissions and a focus on energy efficiency, China has made a commitment to cap their primary aluminum smelting capacity at 45 million metric tons of annualized capacity, which leaves little room for any net production growth. We expect China will remain a net importer of primary aluminum. In the alumina market, pricing remains higher relative to 2021 average, but supply constraints in primary aluminum production have reduced demand. Also, some of the disruptions in supply at ex- China refineries in 2021 have either recovered or are in the process of being resolved. Our position in the alumina market remains strong and advantaged. We are the world's largest producer of third party smelter grade alumina outside of China. And our refining system uses less caustic soda per ton of alumina produced and it is optimized for an integrated bauxite supply. We are also proud to have a global refining system with the industry's lowest carbon intensity. And we're the only refiner to sell EcoSource, a low carbon alumina brand that allows an aluminum smelter to reduce its carbon emissions simply by switching to this product. In our view, our refining system and our unique product offering provides a sustainable advantage in a rapidly evolving world. Next, I'd like to take a deeper look at the aluminum market. The average view from analysts is that 2021 ended with close to a 1 million metric ton global deficit and another deficit of approximately 1.4 million metric tons is expected in 2022. All of this is happening at a time when inventories are at their lowest level in a decade. Looking at inventory levels from days of consumption perspective, inventories returned to a low point of 52 days of consumption at the end of 2021. If the deficit projection for 2022 holds, we expect inventories could sink to a new low of 44 days of consumption by the end of 2022. Despite deficit market conditions in inventories at low levels, we are continuing to see supply constraints due to challenges related to power and the emphasis on sustainable production. An interesting case study lies in the latest market dynamics in Europe. In this important aluminum market, average spot power rates increased between 200% and 400% between January and December of 2021 driving cuts in smelting capacity across Europe. This chart shows in dark blue the countries where smelting capacity has been reduced due to power issues. We estimate these cuts have impacted between 600,000 and 700,000 tonnes of annualized capacity, which represents around 15% of Europe's operating capacity. This demonstrates the pressure that aluminum smelters will increasingly face during the transition from fossil fuels to more renewables. And as I mentioned earlier, the structural changes driven by decarbonization should give low carbon operators like Alcoa a sustained competitive advantage in the future. However, we weren't without our own challenges as it relates to power prices in Spain. And I'd like to next recap the news we issued at the end of 2021, related to the San Ciprián Smelter. As we've discussed previously, on these earnings calls, we've been working to find the solution to the unfavorable energy prices for our San Ciprián Smelter. Even with the positive shifts we've seen in aluminum pricing, the smelter has continued to lose money primarily because of the exorbitant energy prices in Spain. The price of electricity there hit an all time high late last year, averaging approximately 240 euros per megawatt hour in the month of December. On December 29, 2021, we signed an agreement with workers representatives at San Ciprián to temporarily curtail the smelter for two years to control our losses. We will use that time to find an energy solution via long term power purchase agreements; we've committed to restart the smelter in January of 2024. We started the curtailment process earlier this month, and expect all molten metal production from the smelter will cease by the end of this month. With the agreement, we expect annual net losses between $20 million to $25 million, both this year and in 2023. While the situation is not ideal, it was important for everyone to have clarity on the losses and importantly, to have a clear timeline to resolve the issues and define a date to restart with new power arrangements. We will continue to operate the casthouse during the smelters curtailment, using accumulated inventory that could not be shipped during the strike action. The agreement with the workers representatives ended the strike, which also had negative effects on our refinery. There is certainly much to be done during this two year period, but we look forward to working toward a more successful San Ciprián Smelter. Next, as I mentioned at the beginning of our call, our achievements across 2021 truly showcase our efforts toward becoming a more streamlined, efficient and high performing commodity focused company. For the past five years, we have worked on improving our foundation financially, operationally, and strategically. Now we are ready for the future. We are embracing opportunities to reinvent how we operate, innovating for long term impact and challenging the status quo. These accomplishments reflect our company's overarching purpose to turn raw potential into real progress. This purpose combined with our Alcoa values serves as our foundation. It helps guide every goal we set, decision we make, action we take and the strategy we implement. I'd like to highlight only a few of the many accomplishments listed on this slide. From a commercial standpoint, we have the industry's most comprehensive suite of low carbon products in our Sustainer family. Last year, we sold our first commercial shipments of EcoSource alumina, the industry's only low carbon smelter grade alumina. Also, we sold our low carbon EcoLum aluminum for the wheels on the Audi Etron GT electric sports car. The wheels use both EcoLum aluminum and metal from our ELYSIS joint venture, a revolutionary technology that eliminates all direct greenhouse gas emissions from the smelting process. In our operations, we continue to make important advancements and I'd like to recognize just a few. In Australia, our Huntly bauxite mine had a very strong year in nearly matched its 2019 record for drying metric tons. In alumina, our Kwinana refinery in Australia had its best ever annual production in 2021. In Norway, we had record molten production at Mosjøen and record buildup production at Lista. In Canada, all three of the operations in Quebec are now certified to the aluminum Stewardship Initiative, and set annual molten production records. Finally, in Brazil, the Alumar refinery recovered from the bauxite ship on motor damage and set a quarterly production record in the fourth quarter. On our portfolio, we've made very good progress in addressing our production capacities to create a set of cost competitive and sustainable operating assets. Our vision to reinvent the aluminum industry for a sustainable future really helps to define our next challenge to innovate and create low carbon solutions that our world needs. And to solve some of our industry's most pressing challenges. That's included here in our future oriented research and development projects, which have the potential to not only transform the industry, but drive important value for our investors in a carbon constrained world. We are addressing these challenges with cost competitiveness in mind, we need to solve for low carbon, but also for low cost, and low capital. And finally, on this slide, we had numerous financial accomplishments in the year, which provide a much stronger foundation for Alcoa's future. But to be successful, we must build on the positive momentum. So next, I'll discuss a few of the items on our list for this New Year. In 2022, we will focus on safely completing the full smelter restart at Alumar in Brazil, and the restart of some modest additional capacity at the Portland smelter in Australia. As I mentioned, we are also actively working on the energy situation at San Ciprián. In Brazil, we will be implementing some important capital projects, which include the mine move for Juruti bauxite crusher. For Poços de Caldas, we are working on the installation of press filtration for bauxite residue, bringing technology to Brazil that we first adapted at two Western Australian refineries. Finally, we will continue to investigate additional pension annuitization actions to reduce risk as market conditions allow. At the same time, we are focused on new technologies. We share this information at our Investor Day in November. If you've not had the chance to view that material, we've kept it archived on the investors section of our website. I would like to briefly revisit some of this today due to its importance and how it aligns with our purpose and vision. We are at a time when the world needs more sustainable solutions, and Alcoa is well positioned to make a positive difference and drive value. We are addressing these challenges with a commodity cost conscious mindset supported by operational and technical experience. The technology roadmap which includes ELYSIS Australia technology and the refinery of the future, provide a path to help reach our net zero ambition, which we announced last October. The projects also have the potential to further differentiate Alcoa and drive stockholder value. Our refinery of the future redesign in our ELYSIS zero carbon smelting technology, our research and development projects that not only aim to reduce costs and improve efficiency, but also target complete reduction of greenhouse gas generation from their respective production processes. This year, our ELYSIS joint venture will begin detailed planning for its supply chain, including the production of the proprietary anode cathode materials that are critical to the carbon free smelting process that was first developed at the Alcoa Technical Center. Also, work is underway for additional commercial sized testing next year at 450 kilo amperes. With the current development pathway, the JV ends to have technology available for installation from 2024, allowing potential adopters to produce carbon free aluminum approximately two years later. Another exciting R&D project is our Australia process. We are working to ramp up this innovation which can purify aluminum scrap to levels that far exceed the commercial grade quality of metal produced from the smelter. As the world needs more aluminum, the technology can leverage the vast quantities of low value automotive scrap. We can use this material as a feed source to create high purity aluminum that can be converted for premium end use applications such as aerospace. The technology is currently working at bench scale, and we plan to develop a pilot demonstration facility next year, with engineering and design work taking place this year. Next, our refinery of the future project bundles numerous technologies and process improvements to eliminate emissions while also developing beneficial applications for bauxite residue. From an emissions standpoint, the refinery of the future will involve two primary innovations we're working to develop; mechanical vapor recompression, which has financial support from the Australian Government and electric calcination. Adapting mechanical vapor recompression to refining could replace all fossil fuel energy consumed in our boilers, allowing refineries to operate from renewable electricity. Calcination is the final stage in the refining process where alumina hydrate crystals are heated to remove water molecules. Converting that process to renewable energy, rather than fossil fuels would allow all of the steam generated by the cal finders to be captured and reused, which would also significantly reduce water use. Next, we announced last year the beginning of a joint development project related to the market for High Purity Alumina, or HBA. A non metallurgical alumina HPA is used for items like lithium ion batteries, and energy efficient LED lighting applications and other sapphire glass products. It's a market expected to grow due to the need for low carbon solutions in transportation, and other sectors. The first pilot trials have so far produced average purity levels that align with what is expected in the HPA market. Finally, you'll see on the far right side of this slide our estimates for future capital to support these projects. Importantly, there are several stage gates for each of them, which are still in the R&D phase and full project funding is not yet approved. To be implemented, each one must provide expected stockholder returns. Next, with so much financial progress, I want to revisit the capital allocation framework, which we simplified late last year. You'll notice there are some important similarities from our prior framework. We will continue for example to focus on a strong balance sheet through the cycle, which includes both our cash and our net debt position. Next, we will continue to allocate capital dollars to both sustain and improve our operations. This year, we've increased our sustaining capital to $450 million, up from $356 million the prior year. This change is driven mostly by the planned mine move at Juruti and improvements to some impoundments. Below the line on the chart for value creation, we have three elements listed in no specific order of priority, returning cash to stockholders, transforming the portfolio and positioning for growth. On returning cash to stockholders, we initiated our first cash dividend in the fourth quarter, totaling $19 million at $0.10 per share. We also closed out in Q4 a prior $200 million buyback authorization repurchasing 3.2 million shares. We currently have an unused $500 million buyback program available. Next, on strengthening the portfolio to our transformation process. It's important to emphasize again that we have options to mitigate closure costs. The sales of non core assets, for example, in 2021 helped to offset costs associated with closer actions. On the portfolio transformation, as noted earlier, we've now addressed roughly 75% of our 1.5 million metric tons of smelting capacity, as we're just now past the two year mark on the five year program, which we first announced in October of 2019. The tally includes the two year curtailment and future repowering at San Ciprián, the curtailment of Intalco and permanent closure of Wenatchee both in the United States, the full restart now underway at Alumar in Brazil, and the repowering at Portland aluminum in Australia, including restarting a Bécancour capacity. Finally on this slide, our capital allocation includes positioning our company for growth with a key timeframe in 2024 as we develop and implement technology innovations after progressing through appropriate stage gates. To summarize, 2021 provided an opportunity to demonstrate the work we've been doing across our business in our segments. Alcoa employees across the globe have made difference. We focused on the fundamentals as a commodity based company, strengthening our foundation for a brighter future. In 2021, it all came together; we made our highest ever adjusted net income. We also saw strong profitability from our aluminum segment with robust market pricing. We expect stronger markets to continue due to positive changes in the aluminum industry, including meaningful supply constraints in China. Next, we've positioned Alcoa to have strength through the market cycles, which supported our decision to provide the capital returns we announced for the fourth quarter. Finally, after the challenges the industry has faced over the prior decade, it's a very good time to be in the upstream aluminum business. We are the right company at the right time. One, where the industry is fundamentals are changing. The importance of excellence in environmental, social and governance standards are coming to the forefront. This is a change that benefits our company now and in the future. Thank you once again for your trust in our company as we work to drive value for the future. And with that Bill and I are eager to take your questions. Operator, who do we have on the line?