claim: More than 500 scientists and professionals in climate and related fields have sent a 'European Climate Declaration' to the Secretary-General of the United Nations.
evidence: It was signed by 15,364 scientists from 184 countries, what made it the letter with the most signatures of scientists in history In November 2019, more than 11,000 scientists from 153 countries published a letter in which they warn about big threats to sustainability from climate change if big changes in policies will not happen.