The best replacement for ecology is environment.

The best alternatives to ecology are rated as following:
★★★★★  environment
★★★★  economy
★★★  environmental science
★★★  biology
★★  environmentalism
★★  ecosystem
★  deep ecology
★  applied ecology
★  zoology
★  social ecology
★  ecological ethics
  wildlife biology
  gaps
  shallow ecology
  ecofeminism
  environmental studies
  taxonomy
  natural history
  environmental sciences

Your alternative for ecology is not listed? Suggest!
Speaking about ecology, one probably shouldn't forget about nature.

Other search terms related to ecology and their ratings are:
★★★★★ nature
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Google Trends

Scale is based on the average worldwide traffic of ecology in all years. Click on graph for more.
ecology
environment
economy