Which major nature-focused organization completely redesigned its iconic logo in 2011 specifically to address climate change awareness?

In today's environmentally conscious marketplace, many nature-focused brands have created iconic logos that instantly connect consumers with the natural world. These symbols not only represent company values but often tell powerful stories about conservation, sustainability, and our relationship with nature. Test your knowledge of these famous natural world brand identities and see if you can identify which pioneering company made a groundbreaking logo change for environmental reasons.

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World Wildlife Fund (WWF) - changed from a detailed panda to a minimalist black and white design to symbolize the stark choices facing endangered species
National Geographic - altered its yellow rectangle border to include melting ice caps at the corners to represent global warming
The Nature Conservancy - replaced their oak tree with a half-green, half-brown version to illustrate deforestation impacts
Sierra Club - updated their evergreen tree symbol to include subtle temperature gradient colors representing climate data