3) Since the Industrial Revolution began around 1750, human activities (powered mostly by fossil fuels) have contributed substantially to climate change by adding CO2 and other heat-trapping gases like methane and the ozone depleting gases like the chloro-floro-carbons to the atmosphere. These greenhouse gas emissions have increased the greenhouse effect and caused Earth's surface temperature to rise.
4) Resources are distributed in different ways and in different amounts throughout the world. Often as a result of past geologic processes such as volcanic activity or tectonic movement, this unequal distribution means that various quantities of certain resources like marine resources, arable land, minerals, etc. are only available to some people. The distribution of natural resources depends upon many physical factors like land, climate and altitude. The distribution of these resources is unequal because these factors differ from place to place on earth. One of the most striking examples of the unequal distribution of resources on the planet is the existence of chronic hunger in some parts of the world and the undevelopement of some places due to lack of natural resources availability. Increased international trade from the removal of trade barriers has narrowed down resources distribution among and within some nation states. Many wealthier countries export non-land-intensive goods and services in return for agricultural and animal products amongst others examples.
