Carbon dioxide and global warming

Explanation

Burning coal, oil and natural gas adds carbon dioxide to the atmosphere. Deforestation can add more when cleared vegetation burns or decomposes. Removing trees also reduces the photosynthetic uptake that would otherwise remove carbon dioxide from the air.

Earth absorbs sunlight and emits energy as infrared radiation. Carbon dioxide and other greenhouse gases absorb and re-emit some outgoing infrared radiation, reducing the rate at which energy escapes to space. Increasing their concentration strengthens this greenhouse effect and raises average global temperature until a new energy balance is reached.

Actions that reduce fossil-fuel combustion address the input of carbon. More efficient buildings and transport reduce energy demand; low-carbon energy sources reduce emissions for a given energy supply. An answer should identify what changes, not simply say that technology solves warming.

Protecting forests avoids loss of stored carbon and preserves uptake. Restoration can increase carbon storage over time while supporting habitats. It complements emissions reduction but cannot instantly cancel unlimited fossil-fuel emissions; establishment takes time and stored carbon can be released by disturbance.

People can also adapt to effects already occurring, for example by protecting coastal habitats that reduce erosion or designing for heat and flood risks. Adaptation reduces harm from a changing climate; it does not automatically reduce the greenhouse-gas cause. Useful decisions combine a clear mechanism with practical limits and effects on ecosystems and people.