If world average temperature increases up to 4ºC by 2050, then explain the possible
impact of global warming on human communities and biodiversity of Rajasthan desert,
Central India forest, and coastal areas of India, respectively.
Answers
Answer:This report spells out what the world would be like if it warmed by 4 degrees Celsius, which is what scientists are nearly unanimously predicting will happen by the end of the century if no significant policy changes are undertaken.
It is a stark reminder that climate change affects everything. The solutions lie in effective risk management and ensuring all our work, all our thinking, is designed with the threat of a world in which warming reaches 4°C above preindustrial levels (hereafter referred to as a 4°C world ) in mind.
The President of the World Bank Group, is very clear in its foreword of the report : The explored consequences of an increase of the global earth temperature of 4°C are indeed devastating.
Among the foreseen consequences are:
the inundation of coastal cities;
increasing risks for food production potentially leading to higher malnutrition rates; many dry regions becoming dryer and wet regions wetter;
unprecedented heat waves in many regions, especially in the tropics;
substantially exacerbated water scarcity in many regions;
increased frequency of high-intensity tropical cyclones;
irreversible loss of biodiversity, including coral reef systems.
The scientific evidence, is unequivocal about the fact that humans are the cause of global warming, and that major changes are already being observed: global mean temperature is now 0.8°C above pre industrial levels; oceans have warmed by 0.09°C since the 1950s and are acidifying. Sea levels rose by about 20 cm since pre-industrial times and are now rising at 3.2 cm per decade; an exceptional number of extreme heat waves occurred in the last decade; major food crop growing areas are increasingly affected by drought.
The World Bank is well aware of the uncertainties that surround these scenarios and that different scholars and studies sometimes disagree on the degree of risk, but the fact that such scenarios cannot be discarded is sufficient to justify strengthening current climate change policies.
This why the global conclusion of the report is that the projected 4°C warming simply must not be allowed to occur—the heat must be turned down. Only early, cooperative, international actions can make that happen.