| hydrology(noun, feature, environment, issue) |
| land degradation(expression, feature, environment, issue, land) |
| tile drainage(expression, feature, environment, issue, farming) |
| biocapacity(noun, feature, environment, issue, population) |
| carrying capacity(expression, feature, environment, issue, population) |
| exploitation(noun, feature, environment, issue, population) |
| human overpopulation(expression, feature, environment, issue, population) |
| industrialisation(noun, feature, environment, issue, population) |
| land reclamation(expression, feature, environment, issue, population) |
| optimum population(expression, feature, environment, issue, population) |
| overdrafting(noun, feature, environment, issue, population) |
| overshoot(noun, feature, environment, issue, population) |
| population density(expression, feature, environment, issue, population) |
| population dynamics(expression, feature, environment, issue, population) |
| population growth(expression, feature, environment, issue, population) |
| projections of population growth(expression, feature, environment, issue, population) |
| total fertility rate(expression, feature, environment, issue, population) |
| urbanization(noun, feature, environment, issue, population) |
| waste(noun, feature, environment, issue, population) |
| water conflict(expression, feature, environment, issue, population) |