Answer:
Because that is when oil and other harmful fumes to ecosystems first started appearing, and they did not care about animals back then as much, an example could be when they sprayed pesticides to kill weeds but instead almost killed a huge bird population. Most marine animals did not start dying and becoming endangered species until we did many oil spills into the ocean.
Explanation:
hope this helped i want to be a marine biologist when i graduate uwu
