Claim: Just 0.7% of the world’s forests are coastal mangroves, y​​​​​​et they store up to 10 times as much carbon per hectare as tropical forests.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Amazonian forests are estimated to have accumulated 0.62 ± 0.37 tons of carbon per hectare per year between 1975 and 1996.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Net primary production is estimated at 21.9 gigatonnes carbon per year for tropical forests, 8.1 for temperate forests, and 2.6 for boreal forests.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Mangrove forests are an important part of the cycling and storage of carbon in tropical coastal ecosystems.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Tropical peatlands comprise 0.25% of Earth’s terrestrial land surface but store 3% of all soil and forest carbon stocks and are mostly located in low-income countries.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Per hectare, it holds twice as much carbon dioxide as rain forests and can sequester about 27.4 million tons of CO2 annually.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Globally, for example, peatlands cover only 3% of the land surface but store twice the amount of carbon as all the world's forests, whilst mangrove forests and saltmarshes are examples of relatively low-biomass ecosystems with high levels of productivity and carbon sequestration.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Mangroves are trees or shrubs that grow in low-oxygen soil near coastlines in tropical or subtropical latitudes.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Wetland soil is an important carbon sink; 14.5% of the world's soil carbon is found in wetlands, while only 6% of the world's land is composed of wetlands.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The mangrove ecosystem is also an important source of food for many species as well as excellent at sequestering carbon dioxide from the atmosphere with global mangrove carbon storage being estimated at 34 million metric tons per year.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Although tropical peatlands only cover about 0.25 % of the Earth 's land surface they contain 50,000-70,000 million tonnes of carbon (about 3 % global soil carbon).

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Although distributed across 105 nations, the top 10 mangrove holding nations contain approximately 52 % of the global mangrove stock with Indonesia alone containing between 26 % and 29 % of the entire global mangrove stock.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Most of the terrestrial diversity is found in tropical forests and in general, land has more species than the ocean; some 8.7 million species may exists on Earth, of which some 2.1 million live in the ocean.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The Guinean mangroves are a coastal ecoregion of mangrove swamps in rivers and estuaries near the ocean of West Africa from Senegal to Sierra Leone.