The tech giant has unveiled its bold plan to help save the planet from climate change, with the overall goal of removing all the carbon it's created since its foundation in 1975 over the next 30 years.
The company's "aggressive programme" involves cutting carbon emissions from direct sources - and from the chain of firms it collaborates with on its products - with a $1 billion "climate innovation fund" helping with the efforts.
Microsoft will detail its progress in an annual Environmental Sustainability Report.
CEO Satya Nadella said: "We must begin to offset the damaging effects of climate change, and that's what we are here to talk about today.
"The scientific consensus is clear. The world, today, is confronted with an urgent carbon crisis. If we don't curb emissions and the temperatures continue to climb, the science tells us the results will be devastating."
Meanwhile Microsoft has encouraged other companies to do their bit.
Nadella added: "Each of us is going to need to take action, and that includes businesses. No one company can solve this macro challenge alone, but as a global technology company, we have a particular responsibility to do our part.
"That's why today we're announcing an ambitious new plan to help address the sustainability of our planet."