New research has found preparing land for palm oil plantations and the growth of young plants causes significantly more damage to the environment, emitting double the number of greenhouse gases than mature plantations.
© Photo taken by researcher Stephanie Evers | Preparing land for palm oil causes most climate damage

This is the first study to examine the three main greenhouse gas emissions across the different age stages of
 . It was carried out by plant scientists from the University of Nottingham in the North Selangor peat swamp forest in Malaysia with support from the Selangor State Forestry Department. It has been published today in Nature Communications.
Palm oil is the most consumed and widely traded  in the world. Global demand has more than tripled in the last eighteen years, from around 20 million tonnes in 2000 to over 70 million in 2018 and Malaysia is the world's second-largest producer. The University of Nottingham researchers analyzed five sites at four different stages of land use: secondary forest, recently drained but uncleared forest, cleared and recently planted young oil  plantation and mature oil palm .
Laboratory analysis of soil and gas from these sites showed that the greatest fluxes of CO2 occurred during the drainage and young oil palm stages with 50% more greenhouse gas emissions than the mature oil palms. These emissions also account for almost a quarter of the total greenhouse emissions for the region.
Intensive drainage
Tropical peat swamp forests hold around 20% of global peatland carbon. However, the contribution of peat swamp forests to carbon storage is currently under threat from the large-scale expansion of drainage-based agriculture including oil palm and pulpwood production on peatlands.
Draining peatlands increases the  in the soil, which in turn increases the rate of decomposition of organic material, resulting in high CO2 emissions from drained peatlands. In addition to CO2, peatlands also emit the powerful greenhouse gases (CH4 and N2O8).
Dr. Sofie Sjogersten from the University of Nottingham's School of Biosciences led the research and said: "Tropical peat swamps have historically been avoided by palm oil growers due to the amount of preparation and drainage the land needs, but as land becomes more scarce there has been an increased demand to convert sites and the periphery of North Selangor is being heavily encroached upon by palm oil plantations. Our research shows that this conversion comes at a heavy cost to the environment with greater carbon and  being caused by the early stages of the growth of palm oil."
This article was originally published by the University of Nottingham.
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