英语翻译Skeptics are strange a lot.some of them refuse to admit

英语翻译
Skeptics are strange a lot.some of them refuse to admit the serious threat of human activities to the environment ,and they are tired of people disagree with them.Those people,say skeptics,spread nothing but bad news about the environment.在这里我不清楚的是.some of them 的指代和Those people 的指代.