Planting trees in deserts to fight climate change
Planting trees in coastal deserts could capture carbon dioxide, reduce harsh desert temperatures, boost rainfall, revitalise soils and produce cheap biofuels, say scientists.
Large-scale plantations of the hardy jatropha tree, Jatropha curcas, could help sequester carbon dioxide through a process known as 'carbon farming', according to a study based on data gathered in Mexico and Oman that was published in Earth System Dynamics.
Each hectare of the tree could soak up 17-25 tonnes of carbon dioxide a year, they say, at a cost of 42-63 euros (about US$56-84) per tonne of gas, the paper says. This makes the technique competitive with high-tech carbon capture and storage.Klaus Becker, the study's lead author and director of carbon sequestration consultancy Atmosphere Protect, says that a jatropha plantation covering just three per cent of the Arabian Desert could absorb all the carbon dioxide produced by cars in Germany over two decades.
"Our models show that, because of plantations, average desert temperatures go down by 1.1 degree Celsius, which is a lot," Becker says. He adds that the plantations would also induce rainfall in desert areas.
Jatropha, which is a biofuel crop, needs little water, and coastal plantations would be irrigated through desalination, Becker says.
Jatropha Tree plantation image via Shutterstock.
Read more at ENN Affiliate SciDevNet.