| Introduction | Geopolitics | Population | Food | Development | Environment | Home |
| Introduction | Geopolitics | Population | Food | Development | Environment | Home |
tariff - a tax paid on imported goods designed to raise the price of imports in relation to domestic goods
thermal pollution - the degradation of water by the discharge of cooling water usually from electrical generation plants and large industrial complexes
troposphere - the lowest layer in the atmosphere ranging in thickness from 7 km at the poles to 28 km at the equator - the Earth's weather occurs within this layer
urbanization - growth in the proportion of the population living in cities in relation to those who live in rural areas
