In climate news, an alarming new report published in the journal Nature Communications finds that without immediate action to curb greenhouse gas emissions, melting Arctic permafrost could add as much as $70 trillion to the overall economic impact of climate change. Meanwhile, a draft United Nations report obtained by Agence France-Presse Tuesday reveals up to 1 million species are at imminent risk of extinction due to human behavior. The report, which is set to be released on May 6, warns the accelerating loss of clean air, drinkable water and biodiversity poses a threat no less severe than climate change.