Question

which greenhouse gas has an average lifetime in the atmosphere of a few weeks to thousands of years and is the largest contributor to climate change? carbon dioxide methane nitrous oxide fluorinated gas

Explanation:

Carbon dioxide ($\text{CO}_2$) has an atmospheric lifetime ranging from weeks (for some short - term processes) to thousands of years (due to long - term carbon cycle processes like ocean absorption and rock weathering). It is also the largest contributor to climate change among the given options. Methane has a shorter lifetime (around 12 years), nitrous oxide has a longer lifetime (around 120 years), and fluorinated gases have varying lifetimes but are not the largest contributors to climate change on a global scale compared to carbon dioxide.

Answer:

carbon dioxide