现在很少有人否认全球变暖是由人类引起的。

Very few people now deny that ___global ___warming is caused by humankind.

此外，由于全球变暖，海平面可能上升，洪水风险也会增加。

Also, due to ___global ___warming, sea levels might rise and the risk of flooding will also rise.

科学家警告说，全球变暖可能对生态系统产生毁灭性影响。

Scientists warn that ___global ___warming could have devastating effects on ecosystems.