Question

the environmental effects of an individual or group in terms of resources used and waste produced
environmentalism

theory

ecological footprint
sustainable

Explanation:

The definition given is about the environmental impact of an individual or group regarding resources used and waste produced. "Ecological footprint" is defined as the environmental impact of an individual or group in terms of resources used and waste produced. "Environmentalism" is a social movement, "theory" is a general concept, and "sustainable" refers to something that can be maintained. So the correct term matching the definition is "ecological footprint".

Answer:

ecological footprint