Energy (electricity, heat and transport): 73.2% Energy use in industry: 24.2% Let’s walk through each of the sectors and sub-sectors in the pie chart, one-by-one. These descriptions are based on explanations provided in the IPCC’s Fifth Assessment Report AR5) and a methodology paper published by the World Resources Institute. To know what’s included in each sector category, I provide a short description of each. The overall picture you see from this diagram is that almost three-quarters of emissions come from energy use almost one-fifth from agriculture and land use and the remaining 8% from industry and waste. 2 This is the latest breakdown of global emissions by sector, published by Climate Watch and the World Resources Institute. In this post I present only one chart, but it is an important one – it shows the breakdown of global greenhouse gas emissions in 2016.
To figure out how we can most effectively reduce emissions and what emissions can and can’t be eliminated with current technologies, we need to first understand where our emissions come from. The world emits around 50 billion tonnes of greenhouse gases each year. The level of carbon dioxide in Earth’s atmosphere has been rising consistently for decades and traps extra heat near Earth's surface, causing temperatures to rise.To prevent severe climate change we need to rapidly reduce global greenhouse gas emissions. But in the last century or so, humans have been interfering with the planet's energy balance, mainly through the burning of fossil fuels that add carbon dioxide to the air. Part of what makes Earth so amenable is its natural greenhouse effect, which keeps the planet at a friendly 15 ☌ (59 ☏) on average. For that reason, Earth is sometimes called the “Goldilocks” planet – its conditions are not too hot and not too cold, but just right to allow life (including us) to flourish. Greenhouse gases occur naturally and are part of our atmosphere's makeup.
Without carbon dioxide, Earth's surface would be some 33☌ (59☏) cooler. Remove carbon dioxide, and the terrestrial greenhouse effect would collapse. (Water vapor, which responds physically or chemically to changes in temperature, is called a "feedback.") Scientists have determined that carbon dioxide's warming effect helps stabilize Earth's atmosphere. Greenhouse gases include carbon dioxide, methane, nitrous oxides, and water vapor.
The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.” These heat-trapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them.
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