Human activities that do not cause an imbalance in the water cycle and the carbon cycle are considered eco-friendly. the activities that cause an imbalance in the cycles are considered not eco-friendly. classify the activities as being eco-friendly or not eco-friendly. answers: 1) recycling materials 2) filling landfills 3) cutting trees 4) growing trees 5) burning fossil fuels 6) burying organic matter 7) using fewer disposables mtaching eco-friendly / not eco-friendly