What are you curious about in Environmental Science class?

I'm curious about how we are able to live on this earth. What would happen if a certain species of animals or insects become extinct, how would that affect us. I am also curious about our earth and what major environmental issues we are facing. I would love to learn about what is effecting us and what's possibly destroying our earth. Then learn about different solutions to these problems.  I'm also curious about planting and the whole process of growing a vegetable or fruit. Learning specifically what makes some vegetables grow extra healthy while others are weak and brittle. I'm curious to see what kind of techniques there are to growing different kinds of plants.