Nothing to worry about what? About the temperature reaching its upper limit? How about its effect in nature? I don't think its gonna be that easy. Yes, the earth has a way to compensate for it and that might get extreme for humans. You see we are experiencing lots of abnormal phenomenon and global warming might be a part of it. It's not nothing to worry about. It kills people, it damages property. It's must not be taken for granted just because some scientists or reports says it reach its peak.