For this reason, the current global warming is incredibly frightening. Our human ancestors, at 400,000 years of age, are fairly recent arrivals to Earth. However, in our short time on this planet, we humans have rapidly accelerated the rate of climate change by burning fossil fuels for energy, thereby releasing carbon dioxide and other greenhouse gasses that trap heat into the atmosphere. Already, it is estimated that current-day global warming has killed more than 500 species of animals, and humans could be the next victims of extreme weather events, fires, floods, famine, social instability, mass migration and wars resulting from climate change. Leading scientists believe that transitioning the world to renewable energy can stop and possibly reverse climate change, reducing existential risk to humanity. So, the fight to transition to green energy is possibly a fight for the future of humanity.