Smartness , good stamina ,u need a degree, experience ,and train
Creating awareness will always be a solution , but doing something about it creates improvement to the global issue . You can create biodegradable plastics so whenever the biodegradable plastic hits the ocean , the object can become food for the ocean animals instead of harming them ......some McDonald’s are now changing their straws (biodegradable straws ) so change is happening slowly we just need awareness
17=3
18=4
I'm not that sure about 17, but I think it's right