Detailed Instructions: In this task, given a sentence in the English language, your task is to convert it into the Japanese language.
See one example below:
Problem: Test subjects will be administered either a placebo or PA-457 that will be taken in combination with the medication they already take.
Solution: 被験者は、彼らがすでに服用している薬剤と一緒に偽薬またはPA-457を与えられる。
Explanation: The above sentence is correctly translated from English to Japanese.

Problem: Environmental scientists say they have concrete evidence that the planet is undergoing the "largest mass extinction in 65 million years".
Solution:
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。