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The graph above shows the average of a set of temperature simulations for the 20th century (black line), followed by projected temperatures for the 21st century based on three greenhouse gas emissions scenarios (colored lines).This article discusses the potential impact of climate change depending on different levels of future global warming.The social impact of climate changes will be further affected by our efforts to prepare for changes that do occur.
There is a broad scientific consensus that climate change is occurring, and that human activities are the primary driver.
The physical effects of future climate change depends on the extent of prevention efforts (i.e., reducing greenhouse gas emissions).
But the fact remains that global climate is changing the proneness of this climate change is towards warming.
Global warming which is also referred to as climate change, is the observed rise in the average temperature of the Earth's climate system the global surface temperature is likely to rise a further 0.3 to 1.7 °C in the lowest emissions scenario, and 2.6 to 4.8 °C in the highest emissions scenario .
This way of describing impacts has been used in the IPCC (Intergovernmental Panel on Climate Change) Assessment Reports on climate change.
The SRES scenarios were "baseline" (or "reference") scenarios, which means that they do not take into account any current or future measures to limit GHG emissions (e.g., the UNFCCC's Kyoto Protocol and the Cancún agreements).
Some of the graphs show a positive trend, e.g., increasing temperature over land and the ocean, and sea level rise.
Other graphs show a negative trend, such as decreased snow cover in the Northern Hemisphere, and declining Arctic sea ice, both of which are indicative of global warming.
The causes are divided into two categories include "natural" and "human influences" of global warming.
The effects of global warming are the environmental and social changes caused (directly or indirectly) by human emissions of greenhouse gases.