| country(noun, nature, environment, part, world) |
| course in ecological economics(expression, nature, feature, environment) |
| course on ecological economics(expression, nature, feature, environment) |
| create ecological network(expression, nature, feature, environment) |
| create ecological pyramid(expression, nature, feature, environment) |
| created ecological crisis(expression, nature, feature, environment) |
| cryobiology(noun, biology, study, science) |
| cryogenic freezing(expression, nature, feature, environment) |
| cultural macrosystem(expression, nature, feature, environment) |
| cultural system(expression, nature, feature, environment) |
| current ecological crisis(expression, nature, feature, environment) |
| cyclic succession(expression, nature, feature, environment) |
| decline in ecological health(expression, nature, feature, environment) |
| degree distribution(expression, nature, feature, environment) |
| deliver ecological stability(expression, nature, feature, environment) |
| demand for ecological economics(expression, nature, feature, environment) |
| depiction of ecological network(expression, nature, feature, environment) |
| desert(noun, nature, environment, part, world) |
| development of ecological anthropology(expression, nature, feature, environment) |
| development of ecological economics(expression, nature, feature, environment) |