The decline of 45% and 90% through the 21st century.
Climate change is a serious threat to the 240 million people who live across eight countries in the Hindu Kush Himalayas and the 3 billion others who rely on food produced in the area the assessment says.
The consequences of inaction will be devastating the assessment says.
Climate change wants to reduce how much food farmers want to produce in this part of the world. About 70% of the population of this region are farmers, and there are already great food insecurity there.
Ultimately, climate change will probably increase the risk of violent conflict and add to political instability.
The Hindu Kush Himalayan Assessment has been published in China, India, Myanmar, Nepal, Afghanistan , Pakistan, Bangladesh and Bhutan.
The report says that "in terms of its importance, it is less known" about the region and its ecosystems.
"This is a wake-up call," Wester said. Yes, a lot of people want to be in denial Yes, this is a story we do not want to hear because of our day-to-day We need to have a good day out, and we need to have a good time. " Otherwise, we are in trouble. "