In politics, the environment as an issue generally referes to the problem of sustainability - that our civilization currently consumes far more resources, energy, food, freshwater, land than nature can afford and still sustain itself.

climate change, habitat conservation, pollution, land use, sprawl, extinction, endangered species, consumerism, ecology, deep ecology, green philosophy.

[+] Position: Human civilization is part of the environment.

[+] Position: "the environment" is a flawed term - use Ecology.