难于忍受的 meaning in English

grievous

While modest warming has taken place , there is no conclusive evidence human beings are responsible , no conclusive evidence earth ' s temperature is rising dangerously or will reach intolerable levels and no conclusive evidence that warming will do more harm than good
气候是出现了适度的暖化，但并不没有结论性的证据表明和人类有关，也没有结论性证据说明地球的（大气）温度升高得非常危险，或者说到了一种难于忍受的水平，更没有结论性证据说明气候暖化弊多于利（危害多于受益）。