Bündchen used Instagram as the medium to announce the news, just as she did last week when she revealed her involvement in the United Nation's Wild for Life campaign.
"I'm excited to be joining season two of @YearsofLiving Dangerously as a correspondent, exploring deforestation and climate change in my beautiful home country of Brazil," Bündchen, who was appointed as a goodwill ambassador for the United Nations Environment Programme (UNEP) in 2009, wrote in both English and her native Portuguese, alongside an image of her sitting beneath a huge tree, smiling and flicking a peace sign.
The show is expected to air in October, and will run as weekly episodes featuring celebrity investigators - season one included Jessica Alba and Olivia Munn - who are involved in environmental activism and well-known journalists with backgrounds in environmental reportage.
Until then, catch sneak previews of the show on Bündchen's Snapchat ( which she joined earlier this week). The Brazilian beauty has already shared behind-the-scenes footage from a high-speed boat ride on the Amazon River with the caption: "Our beautiful Amazon."