| deforestation(noun, environment, cause, ecology) |
| overpopulation(noun, environment, cause, ecology) |
| extinction(noun, environment, cause, ecology) |
| global temperature rising(expression, environment, cause, ecology) |
| global warming(expression, environment, cause, ecology) |
| nuclear meltdown(expression, environment, cause, ecology) |
| oil spill(expression, environment, cause, ecology) |
| desertification(noun, environment, cause, ecology) |
| ozone layer depletion(expression, environment, cause, ecology) |
| volcanic eruption(expression, environment, cause, ecology) |
| animal extinction(expression, environment, cause, ecology) |
| animal overpopulation(expression, environment, cause, ecology) |
| approach to ecological crisis(expression, environment, ecology, crisis) |
| biodiversity extinction(expression, environment, cause, ecology) |
| challenge of ecological crisis(expression, environment, ecology, crisis) |
| complexity of ecological crisis(expression, environment, ecology, crisis) |
| contemporary ecological crisis(expression, environment, ecology, crisis) |
| created ecological crisis(expression, environment, ecology, crisis) |
| current ecological crisis(expression, environment, ecology, crisis) |
| ecological crisis demand(expression, environment, ecology, crisis) |