The third most popular video of 2019 presents a frightening truth: The best-case scenario of climate change is that the world gets just 2°C hotter, which scientists call the "threshold of

The third most popular video of 2019 presents a frightening truth: The best-case scenario of climate change is that the world gets just 2°C hotter, which scientists call the "threshold of catastrophe".

Why is that the good news? Because if humans don't change course now, the planet is on a trajectory to reach 4°C at the end of this century, which would bring $600 trillion in global climate damages, double the warfare, and a refugee crisis 100x worse than the Syrian exodus.

David Wallace-Wells explains what would happen at an 8°C and even 13°C increase. These predictions are horrifying, but should not scare us into complacency. "It should make us focus on them more intently," he says.

David Wallace-Wells is a national fellow at the New America Foundation and a columnist and deputy editor at New York magazine. He was previously the deputy editor of The Paris Review. He lives in New York City.

A video on Climate Change and Land: An IPCC Special Report on climate change, desertification, land degradation, sustainable land
management, food security, and greenhouse gas fluxes in

A video on Climate Change and Land: An IPCC Special Report on climate change, desertification, land degradation, sustainable land
management, food security, and greenhouse gas fluxes in terrestrial ecosystems

Witness the unveiling of Countdown, a major global campaign to cut greenhouse gas emissions. TED has partnered with scientists, policy makers, organizations, activists and more to create an

Witness the unveiling of Countdown, a major global campaign to cut greenhouse gas emissions. TED has partnered with scientists, policy makers, organizations, activists and more to create an initiative that everyone in the world can be part of. Check out http://countdown.ted.com to learn how you can get involved — and help turn the tide on climate. [Note: there are two unusual features of this TED Talk. One, it's much longer than our normal, extending a full hour. Two, it's made up of contributions from more than a dozen people, including UN Secretary-General Antonio Guterres, Al Gore, Katharine Hayhoe, Jimmy Kimmel and Yuval Noah Harari, among others. We're putting it out there because the topic deserves this kind of prominence.]

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In support of the UN Youth Climate Summit, the Carnegie Climate Governance Initiative (C2G) hosted a series of interactive games for young climate leaders exploring how society might tackle

In support of the UN Youth Climate Summit, the Carnegie Climate Governance Initiative (C2G) hosted a series of interactive games for young climate leaders exploring how society might tackle difficult decisions about whether or not to deploy climate-altering technologies to tackle global heating. Climate Interactive led a thought-provoking “Model-UN-like” negotiating game with the latest En-roads Climate Solutions Simulation – a powerful new interactive exploration of the combined effects of different policies and technologies on the amount of CO2 in the atmosphere, and on global temperatures. The session was held at the offices of Carnegie Council for Ethics in International Affairs, New York City, September 22, 2019.

There needs to be a fundamental shift in the global approach to tackling climate change and the circular economy can play an essential role. 45% of global greenhouse gas emissions come from how we

There needs to be a fundamental shift in the global approach to tackling climate change and the circular economy can play an essential role. 45% of global greenhouse gas emissions come from how we make and use products like buildings, cars and clothes, and how we produce food.

Per Klevnäs is a managing consultant and economist with experience from 100+ energy, resource and climate related projects internationally since the early 2000s. Previous roles have included as an expert in McKinsey’s sustainability practice, Research Director of the New Climate Economy Project, a senior manager at the Stockholm Environment Institute, and Managing Director of an economic consultancy.

At Material Economics, Per help companies set the right direction in the face of new business requirements connected with resource and sustainability topics. He has worked widely across energy, basic materials, manufacturing, and utilities on topics ranging from investment due diligence and acquisition scanning, low-carbon growth strategies, investment planning, product and technology development, and regulatory strategy.

Mayors, entrepreneurs, innovators, students, scientists, dreamers and doers, there are many roles to play in shaping the world of tomorrow. The question that C40s