One of the following regions has the world's largest tropical peatland, which holds about three years worth of global carbon emissions from fossil fuels; and the possible destruction of which can exert detrimental effect on the global climate. Which one of the following denotes that region ?

Defines peat as vegetative matter, an early stage of coal formation, concentrated in bogs — indicating peat is a substantial carbon reservoir.

A student could use this definition plus maps of global peat/peatland distributions to look for where very large peat deposits occur (and whether they lie in the tropics).

Explains that certain ecosystems (mangroves, tidal marshes, seagrasses) store large amounts of carbon and that their degradation releases stored carbon, linking ecosystem loss to global climate impacts.

By analogy, a student could infer that large peatland loss would similarly release carbon and thus check which peatlands are large enough to affect global emissions.

Describes the carbon cycle and how carbon stored in buried organic matter (fossil fuels) can be released when transformed or burned, underscoring the climate significance of large stored carbon pools.

Combine this general carbon-cycle rule with estimates of peat carbon stocks (from external sources or maps) to judge whether a peatland could store multi-year global fossil-fuel emissions.

Explains that rapid release of greenhouse gases from human activities causes global warming, establishing that large, abrupt releases from natural stores would 'harm the global climate.'

Use this principle together with knowledge of large natural carbon stores (peatlands) and their potential carbon contents to assess climatic risk if such a store were destroyed.