India and China are leading global greening efforts that are contrary to popular perceptions around the world, NASA's latest research report says the world has become greener 20 years ago.
According to NASA studies based on data received and analyzed by satellites, India and China are leading the greening on land. Chi Chen, a researcher at Boston University, said: "China and India account for one-third of the green green area, but only 9 percent of the food-covered area.
"This is a remarkable discovery, given the general concept of land degradation in populated countries," he said.
The study, published Feb. 11 in Journal of Nature Sustainability, said recent satellite data (2000-2017) revealed a noticeable pattern in China and India, and a pattern of overlap with global cultivation.
China accounts for only 6.6% of the world's total vegetation area, accounting for 25% of the global net increase in leaf area.
China's greening comes from forests (42%) and cultivated land (32%), but in India, it comes from farmland (82%) and forests (4.4%).
China is building an ambitious plan to conserve and expand its forests to mitigate land degradation, air pollution and climate change.
Food production in China and India has increased more than 35 percent since 2000. This is mainly due to increased harvest area due to fertilizer use and various harvests due to surface and / or groundwater irrigation.
Rama Nemani, a research scientist at NASA's Ames Research Center, said, "When the greening of the earth was first observed, we thought it was due to a warmer, humid climate and the addition of carbon dioxide. Author.
The study was made possible by 20 years of data logging on the Moderate Resolution Imaging Spectroradiometer (MODIS) equipment on NASA's Terra and Aqua satellites. "Now we can see that humans are contributing through the MODIS data," she said.
Nemani said the situation in India and China in the 1970s and 1980s on food loss was not good.
"In the 1990s, people realized it, and now things are improving," he said, "because it's incredibly resilient.
According to this paper, how the future greening trend can change depends on numerous factors.
For example, increased food production in India is facilitated by groundwater irrigation. The depletion of groundwater could change this trend, he said.
The researchers also pointed out that the global increase in green does not necessarily offset tropical natural plant losses such as Brazil and Indonesia. Studies have shown that the sustainability of ecosystems and the landscape of biodiversity are beyond the simple green.