Tributes have been paid to the war photographer Paul Conroy who has died at the age of 61.
"Superpollutants are a major part of the equation to limit atmospheric warming. Experts agree that eliminating them where we can is one of the most powerful levers we have to deliver near-term impact, playing a vital and complementary role to removing CO2," said Randy Spock, Google's carbon credits and removals lead. The gases break down faster than CO2 but can trap heat thousands of times more efficiently, and the coalition claims that aggressive action could prevent more than half a degree Celsius of warming by 2050.
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