* https://colossal.com/mammoth/
The following statement from the same page appears to be their support for the claim that bringing the mammoth back from extinction will benefit the environment:
>The loss of these large cold-tolerant Mammoths over the past 10,000 years has stripped this ecosystem of the grasslands that once efficiently absorbed carbon. Instead, there are mossy forests and wetlands, which aren’t as helpful with combating rising temperatures. However, if the Mammoth Steppe ecosystem could be revived, it could help in reversing the rapid warming of the climate and more pressingly, protect the arctic’s permafrost - one of the world’s largest carbon reservoirs.
>Re-establishing an ecosystem filled with grasslands will help to create a cycle that prevents the thaw and release of stored greenhouse gases within the arctic permafrost. With cold-tolerant elephant mammoth hybrids grazing the grasslands and roaming comfortably during the winters, they scrape away layers of snow, so that the cold air can reach the soil. This also allows grasslands to thrive and since they’re lighter than forestry, the snow won’t melt as quickly. Making way for another benefit - a surface that reflects the Sun’s radiation.