The area of tropical forest destroyed in 2021 was enough to cover the entire island of Cuba, and sent more carbon dioxide into the atmosphere as India does in an entire year from burning fossil fuels, according to an analysis published on Thursday.

Some 11.1 million hectares（around 43,000 square miles）of forest was destroyed, mainly by logging（伐木）as well as fires, the analysis by the World Resources Institute's Global Forest Watch and the University of Maryland found. Some of those fires were deliberately lit to clear land and many were deteriorated by climate change.

The loss was less severe than that in 2020, but deforestation（毁林）is still occurring at an alarming rate in the tropics. Of the area lost, 3.75 million hectares were primary tropical forest at the equivalent of 10 soccer fields every minute, WRI reported.

Primary tropical forests in particular are crucial for the ecological balance of the planet, providing oxygen that supports life and as biodiversity hotspots. They are also rich in stored carbon, and when these forests are logged or burned, they release carbon dioxide into the atmosphere, contributing to global warming.

"What's important to understand is that forests, especially tropical forests, are part of the global climate system," WRI senior fellow Frances Seymour told CNN. "So they're not mechanical carbon storage devices. They actually influence the energy transfer and the moisture content of the atmosphere in ways that affect rainfall and global circulation patterns."

"When deforestation happens, when forests are lost, it not only contributes carbon to the atmosphere, but also disrupts rainfall patterns and increases local temperatures in some ways. For example, it makes remaining forests more vulnerable to fire and the warmer, drier conditions that come with climate change," Seymour said.