Microsoft Rewards will donate 1 dollar for free, you only need to claim the reward under the section redeem points, it is 100% the first dollar, but you can donate extra dollars for 1000 points each.
Microsoft Rewards will match your donation to WWF (World Wildlife Fund not the wrestling thing)! Donate your points by April 30th, 2018 to make the most of your contribution.*
For more than 50 years, World Wildlife Fund (WWF) has been protecting the future of nature. One of the world's leading conservation organizations, WWF works in nearly 100 countries and is supported by more than 1 million members in the United States and 5 million supporters globally. WWF's unique way of working combines global reach with a foundation in science, involves action at every level from local to global, and ensures the delivery of innovative solutions that meet the needs of both people and nature.
*This link MAY NOT work, so GO directly to YOUR
rewards account and look for WWF.