龙腾网 NASA表示地球比年前更绿了 这要感谢中国和印度

2021-11-30 13:12| 发布者:资讯小秘书| 查看:1| 评论:0

摘要:本文核心词:森林,NASA,涨姿势,社会,环境,龙腾网看世界,国外新鲜事The world is literally a greener place than it was 20 years ago, and the data from NASA satellites has revealed a counterintuitive source ...

The world is literally a greener place than it was 20 years ago, and the data from NASA satellites has revealed a counterintuitive source for much of this new foliage: China and India.


This surprising new study shows that the two emerging countries with the world’s biggest populations are leading the improvement in greening on land. The effect stems mainly from ambitious tree planting programs in China and intensive agriculture in both countries. In 2017 alone, India broke its own world record for the most trees planted after volunteers gathered to plant 66 million saplings in just 12 hours.


The greening phenomenon was first detected by researchers using satellite data in the mid-1990s, but they did not know whether human activity was one of its chief, direct causes.


An advantage of the MODIS satellite sensor is the intensive coverage it provides, both in space and time: MODIS has captured as many as four shots of every place on Earth, every day for the last 20 years.


“This long-term data lets us dig deeper,” said Rama Nemani, a research scientist at NASA’s Ames Research Center and a co-author of the new work. “When the greening of the Earth was first observed, we thought it was due to a warmer, wetter climate and fertilization from the added carbon dioxide in the atmosphere, leading to more leaf growth in northern forests, for instance. Now, with the MODIS data that lets us understand the phenomenon at really small scales, we see that humans are also contributing.”

“这些长期数据让我们可以更深入地挖掘,”NASA艾姆斯研究中心(Ames research Center)的研究科学家、这项新研究的合著者拉马·内马尼说。“当我们第一次观察到地球变绿时,我们认为这是由于气候变暖、变湿,以及大气中二氧化碳的增加,例如,导致北方森林中更多的叶子生长,从而产生了肥料。现在,通过MODIS的数据,我们可以在非常小的范围内理解这种现象,我们发现人类也在做出贡献。”

China’s outsized contribution to the global greening trend comes in large part (42%) from programs to conserve and expand forests. These were developed in an effort to reduce the effects of soil erosion, air pollution and climate change. Another 32% there – and 82% of the greening seen in India – comes from intensive cultivation of food crops.


The land area used to grow crops – more than 770,000 square miles – is comparable in China and India and it has not changed much since the early 2000s; yet these regions have greatly increased both their annual total green leaf area and their food production. This was achieved through multiple cropping practices, where a field is replanted to produce another harvest several times a year. Production of grains, vegetables, fruits, and more have increased by about 35-40% since 2000 to feed their large populations.


“Once people realize there’s a problem, they tend to fix it,” he said. “In the 70s and 80s in India and China, the situation around vegetation loss wasn’t good; in the 90s, people realized it; and today things have improved. Humans are incredibly resilient. That’s what we see in the satellite data.”





China has less than half of Americas co2 emissions per capita. The idea that people in large countries should live like medi peasants to have equal carbon emissions to smaller countries is mind bendingly stupid.



Quantity doesnt mean quality. I cut down many trees. You can plant a gazillion trees but that doesnt mean that you create something worthwhile for wildlife, the planet or humans. E.g. the eucalyptus plantations. If reforestation is left by nature or people with just good intentions it doesnt mean really worthwhile ecosystems are created, at least not in the time frame necessary (in the very end nature could sort it out).


What we damaged is not easily replaced and certainly not with the intention of just planting many trees. Reforestation is a serious job but too often not executed in a serious and well thought manner backed by sufficient funds.



Exactly this. A monoculture forest will not support the same rich ecosystem as old growth forests. Clear cutting rain forests is not cancelled out by replanting with one species of fast growing tree.



Thank you China and India. Keep it up. Europe and the Americas need to catch up and keep pace.



Europe and Northern America also increased in amount of trees. Generally, forests are spreading in the developed world. Especially in the last 15 years. This is also one of the reasons that wild fires in Europe are getting more devastating. Because the new forests are more of mono cultures and the tree species that were initially used are rather quick to start burning.

The problem is rather that South America and Africa are suffering from deforestation of very dense rain forest areas.



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