In this task, given a sentence in the English language, your task is to convert it into the Japanese language.
Q: Environmental scientists say they have concrete evidence that the planet is undergoing the "largest mass extinction in 65 million years".
A: 
環境科学者らは、地球が「6500万年中最大の大規模絶滅」に向かっているという具体的な証拠があると言う。