Climate change is driving humanitarian crises worldwide: IPCC report

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They are causing severe and widespread disruption in nature and in society - reducing our ability to grow nutritious food or provide enough clean drinking water, thus affecting people's health and well-being and damaging livelihoods.

Mitigation refers to efforts to reduce emissions, such as initiatives to boost energy efficiency or switch to renewable energy sources, while adaptation strategies are geared at helping communities cope with impacts. This could include building sea walls to keep out the rising sea levels, or developing drainage infrastructure to prevent flooding from bouts of more intense rain.

Changes in temperature, rainfall, and extreme weather have also increased the frequency and spread of diseases in wildlife, agriculture, and people.

Water shortages, which already plague half the world's population at some point in a year, could become worse due to erratic rainfall patterns, or extreme events such as floods or droughts.