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Illustration: Aïda Amer/Axios

13% of nearly 900 cities tracked by the nonprofit CDP get a top rating on climate change action — a fraction of the total population, but roughly double the number of cities on the organization's 2018 list.

Why it matters: Cities create more than 60% of the world's greenhouse gas emissions and consume 78% of the world’s energy. The 105 cities who received an "A" rating from CDP represent a combined population of 170 million.

Where it stands: Big cities in mostly developed parts of the world — including Europe, North America and Australia — dominate CDP's "A List" for taking steps to reduce heat-trapping emissions and adapt to a warmer planet.

  • Los Angeles, Boston, New York City, Baltimore, Mexico City, Toronto, Paris, Berlin, Cape Town and Athens are among those setting strict emissions reduction goals and seeking to adapt to climate hazards like flooding and heatwaves. See the full list here.
  • The U.S. has the most cities on CDP's "A List," followed by Canada and Sweden.

Yes, but: While these cities have set forward-looking goals like lowering carbon emissions by 2050 and using more renewable power for energy consumption, a lot of these actions haven't yet been executed. CDP scores cities on their intent to follow through, which is far from guaranteed.

The big picture: CDP, a London-based nonprofit that asks companies to record their environmental impact, only gave 43 cities an "A" rating in 2018. This year, that figure was bumped up to 105.

  • City-level action to mitigate the effects of climate change is important, but national and international collaboration to cut carbon emissions is even more crucial for sweeping change.

Go deeper: What your city's climate will be in 2080

Go deeper

Updated 14 hours ago - Technology

From Malcolm X to "Free Britney," new media shapes the justice system

Illustration: Shoshana Gordon/Axios

True crime documentaries, podcasts and social media campaigns are bringing new attention to real-world legal proceedings — and are often affecting the outcome.

Why it matters: New media platforms can instantly put a national spotlight on cases that have long been forgotten or buried under red tape.

Updated 17 hours ago - Health

The next big bottleneck in the global vaccination effort

Illustration: Rae Cook/Axios

The world still needs more coronavirus vaccines, but an additional bottleneck has emerged in many low-income countries: They need help getting shots in arms.

Why it matters: Increasing vaccination rates across the world is both a humanitarian necessity and the best way to prevent dangerous new variants from emerging, but it increasingly requires complex problem-solving.

Updated 17 hours ago - Health

COVID-19 Omicron variant cases identified in Europe, U.K.

People wearing masks walk in London on Nov. 25. Photo: Li Ying/Xinhua via Getty Images

Health officials in the United Kingdom, Italy and Germany announced on Saturday that they've detected the first known cases of the new COVID-19 Omicron variant.

Why it matters: The discoveries come as the world scrambles to respond to concerns over the new variant, discovered in South Africa earlier this week.