Yes. If we keep cutting down trees, there would be more carbon dioxide in the air because no trees would breathe in the Co2. Dynamite fishing would destroy the coral reefs which will then lead to the fish either dying or going to other places. Oil spills in the bodies of water will poison the water and the animals and plants in that place which would kill people if they drank the water or eat the fish that were in the water when the oil spill happened. More carbon dioxide in the air will result to the depletion of our ozone layer. Once the ozone layer gets a hole, the radiation from the sun can either kill us or give us cancer.