"Cutting methane is the single fastest, most effective opportunity to reduce climate change risks in the near term," says atmospheric scientist Ilissa Ocko. That's because, unlike carbon dioxide, methane's warming power doesn't come from a gradual buildup over time but is almost entirely from recent emissions. Ocko identifies three main sources of methane pollution which, if addressed, could dramatically slow down the rate of global warming within years -- not decades. "This is the methane moment," Ocko says.

What is AI, really? Jeff Dean, the head of Google's AI efforts, explains the underlying technology that enables artificial intelligence to do all sorts of things, from understanding language to diagnosing disease -- and presents a roadmap for building better, more responsible systems that have a deeper understanding of the world. (Followed by a Q&A with head of TED Chris Anderson)

Computer skills aren't what's stopping people from breaking into the tech industry, says social entrepreneur Irma L. Olguin Jr. More often, the biggest hurdles are things like access to childcare, transportation and financial stability. In this visionary talk, Olguin Jr. introduces the work she's done to uplift and empower people in her community in Fresno, California -- and shows how it can be a model to elevate "underdog" communities across the world.

Co-ops date back almost 200 years, run by groups of people that work together to own and operate a company. What does it look like when this tried-and-true business model merges with the digital economy? Trebor Scholz introduces the "platform cooperative," a new way to create democratic companies of empowered workers -- and develop a better, fairer alternative to the gig economy.

In 2020, China's President Xi Jinping pledged that China would both peak its emissions by 2030 and achieve net-zero emissions by 2060 -- a change that will require action at an unheard-of scale and speed. Can the country actually achieve this ambitious vision? In this forward-looking talk, environmental journalist and analyst Hongqiao Liu explores what the world's largest carbon emitter (and second-largest economy) will need to do to get there.

Work that's dictated by a fixed schedule, place and job description doesn't make sense anymore, says leadership expert Debbie Lovich. In light of the cultural shift towards remote work sparked by the pandemic, Lovich gives three essential tips to leaders so employees can keep their autonomy (while remaining productive), companies can let go of rigid bureaucracy and we can all reshape work to better fit our lives.

Childcare needs a transformation -- but rather than investing billions in new buildings and schools, what if we could unlock the potential of people already nearby? Entrepreneur Chris Bennett offers an innovative way to tackle the shortage of childcare worldwide and connect families to safe, affordable and high-quality options in their own communities.

To fight climate change, we need to clean up the global electricity system by replacing fossil fuel power plants with clean generation -- right? Climate author Solomon Goldstein-Rose thinks we need to do much more than that. Replacement isn't enough, he explains in this compelling talk: we need to rapidly develop a new global system capable of producing 12 times the amount of clean electricity we generate today. He shares four reasons why we need that expansion -- first, to electrify everything in all parts of the world (not just the wealthy ones) -- as well as some intriguing ideas for how we can get there.

We currently have enough fossil fuels to progressively transition off of them, says climate campaigner Tzeporah Berman, but the industry continues to expand oil, gas and coal production and exploration. With searing passion and unflinching nerve, Berman reveals the delusions keeping true progress from being made -- and offers a realistic path forward: the Fossil Fuel Non-Proliferation Treaty. Learn more about the global initiative for transparency and accountability in phasing out fossil fuels forever, supported by the Dalai Lama, Nobel Prize laureates and many more.

Skin is one of the most powerful predictors of health, yet nearly half of all new dermatologists admit to feeling uncomfortable identifying health issues on darker skin tones -- resulting in poorer health outcomes for patients of color. In this crucial talk, TED Fellow and dermatologist Jenna C. Lester shares her effort to extend medical training beyond its current limited scope and ensure all medical students get trained in the full spectrum of diseases as they appear in all patients, regardless of skin tone.