What are 4 human activities that interfere with ecosystems, food chains and food webs.

Dam building, heavy industry, deforestation, irrigation, agriculture, infrastructure, construction, burning fossil fuels, mining, fishing, there is a few that is what I came up with for the ecosystems, and for the food chains and food webs hunting. Hunting interferes with the food chain because the predators are not getting what they want because humans are hunting. 

The answer is telescope.