It is defined as the cumulative radiative forcing both direct and indirect effects integrated over time from the emission of a unit mass of gas relative to some reference gas IPCC 1996. If we do not take the necessary precautions and act now the situation is only going to worsen in the future. Pin On College Life Global Warming is caused by the increase of carbon dioxide levels in the earths atmosphere and a result of human activities that have been causing harm to our environment for the past few centuries now. . Learn about the definition of global warming greenhouse effect causes and effects of global warming greenhouse gases effect global warming solutions and more with BYJUS. What is the conclusion of global warming. Besides Global Warming of 15C the IPCC will finalize two further special reports in 2019. There are several factors that contribute to this issue and the impacts can be seen both socially and environmenta...