because all you can see is that. reporter: blazers in siberia are burning at historic rates because of rising temperatures. point of no return is almost here. reporter: flames are also burning in alaska, thailand, greece. spain. portugal, bolivia. raising fears that even hott et temperatures in the future and the potential for more fires, that would keep releasing additional carbon dioxide, while at the same time, killing more vegetation. scientists say, the only solution is urgently adopted a more sustainable way of life. land is where we live. land is under growing human pressure. reporter: a number of celebrities are also speaking out about the potential globe catastrophe. we ve gone this far and we not only haven t been able to stop it and protect it and