This Met Office article, 'Causes of climate change' (article, Met Office), explains that burning fossil fuels is the main driver of recent warming and outlines how human activities—fossil fuel combustion, deforestation, agriculture and cement production—have increased greenhouse gases and produced an enhanced greenhouse effect, with broad scientific consensus (IPCC) that humans are the leading cause; it is included in Part 1 (chapter 'Your Worth And Power of the Collective') to give readers clear scientific grounding for the book's emphasis on placing values at the heart of action and investment, showing why the climate emergency creates material risks and opportunities across industries and why individual and collective agency matters for purposeful investing.