Belem/New Delhi, Nov. 17 -- How deforestation can be stopped is a central theme at the ongoing UN Climate Conference (COP30), which is being held in the Amazon, to drive home the importance of rainforests in arresting climate change, according to Brazilian president Lula da Silva.

But it is important to ask: where are these most critical ecosystems? A few satellite images can tell us how high and dense rainforest ecosystems are.

The Global Forest Canopy Height tool, with 10m spatial resolution, tells us where the world's densest and tallest (and often oldest) rainforests are located.

They are in Brazil's Amazon rainforests, in Africa's Congo basin, and in parts of Indonesia and Malaysia. In India, they are in the northeast, the Western...