Sea level has risen 200mm in the last 100 years and 81mm in the last 23 years. one of the causes is thermal expansion of the water due to climate warming. what is the other major cause of sea level rise? widespread melting of land ice. widespread subsidence of land due to plate tectonic activity ents due to global temperature rise. change in ocean curr tsunamis. question 3 what are the two main ways that humans contribute carbon dioxide to the atmosphere? 1. burning fossil fuels and farming 2. deforestation and use of nuclear energy 3. raising livestock and farming 04. deforestation and burning of fossil fuels question 4 what's been happening to the global surface temperature since 1910? 01.the global surface temperature has been increasing. o2. the global surface temperature has fluctuated wildly. 3. the global surface temperature has not changed. 04. the global surface temperature has been decreasing