The greatest threat to our world is the destruction of our oceans. Decades of dumping into the oceans have caused catastrophic damage to to animals living in our oceans. The biggest world polluters are places like China and Indonesia were giving a pass on cleaning up their massive pollution and dumping. If climate change was a real concern . a real threat then why did the Paris climate accords give the worst polluters decades to adhere to the global imitative? The real threat is the decay of our oceans with plastic, waste etc. American is lowest on the scale of global polluters. WE CAN NOT CLEAN UP THE WORLD. EVERY COUNTRY HAS TO DO IT PARTS.!