Climate change includes both the global warming driven by human emissions of
greenhouse gases, and the resulting large-scale shifts in weather patterns.
Though there have been previous periods of climatic change, since the mid-20th century,
humans have had unprecedented impact on Earth’s climate system and caused change on
a global scale
The largest driver of warming is the emission of greenhouse gases, of which more than
90% are carbon dioxide (CO2) and methane.
Fossil fuel burning (coal, oil, and gas) for energy consumption is the main source of these
emissions, with additional contributions from agriculture, deforestation, and industrial processes.