I'm 36 now and for my entire life people have been making predictions just like yours, within the next 2,5,10,20 years......, Yet their predictions never come true. Have humans sped up the process of the earth heating up? Maybe, but it doesn't matter much,because it was going to happen anyway. The Earth has gone through 5 major ice ages already. The only hope for humanity surviving forever, is if we continue on our competitive path of science exploration, and technology development etc. We need to seed the universe with humans on as many hospitable planets in as many solar systems, and galaxies as possible. I feel like we will make it happen over time, plenty of people believe we will destroy ourselves before ever getting close. When I look how far humanity has gone in the last century alone I become amazed and awed at our perseverance and ingenuity. We went from first flight on earth, to landing a man on the moon in 66 years. Less than a lifetime. I have faith in the tenacity, and will to survive of our species.