Climate change: A really simple guide to what is happening and why it matters
Impacts already being felt
Climate change is making extreme weather, including heatwaves and heavy rainfall, more frequent and intense. Glaciers and ice sheets are melting rapidly, contributing to rising sea levels. Nepal’s Finance Minister, Swarnim Wagle, said rebuilding could cost up to a tenth of the economy. These examples illustrate the serious effects on communities and economies.
Why the 1.5C limit matters
The 1.5C target is generally understood as an average annual rise measured over 20 years, rather than a single year’s increase. The article says a rise of 2C or more would bring greater impacts, citing the IPCC.
Further warming increases risks to food security in some regions as extreme weather worsens. It may also increase the likelihood of climate-sensitive diseases, including dengue, spreading. The 1.5C limit was partly intended to avoid possible tipping points, such as the collapse of the Greenland Ice Sheet, changes to warm Atlantic Ocean currents, or additional loss of the Amazon rainforest.
Unequal risks and emissions
The IPCC estimates that about 3.3 to 3.6 billion people are highly vulnerable to climate change. The article notes fairness concerns because these places have generally contributed only a small share of greenhouse gas emissions. The IPCC says achieving net zero CO2 emissions is essential to limiting global warming.
Key points
- Human activities, especially fossil fuel use, are driving rising global temperatures.
- Warming is linked to more intense extreme weather, melting ice and rising sea levels.
- The article says 2C or more of warming would bring greater impacts than 1.5C.
- About 3.3 to 3.6 billion people are highly vulnerable, according to the IPCC.