Question

By what percentage has CH₄ (methane) concentration increased above pre-industrial levels since 1750?

Options

• 149%

• 100%

• 180%

• 75%

Answer 1

Methane (CH₄) concentration has increased 149% above pre-industrial levels since 1750. This dramatic increase reflects the expansion of agriculture, livestock farming, fossil fuel extraction, and waste decomposition, making methane a potent greenhouse gas with a higher warming potential than CO₂.