Which of these nature-focused organization logos has remained essentially unchanged for the longest period of time?

The natural world has inspired some of the most iconic logos and brand identities. Companies that focus on sustainability, conservation, and eco-friendly products often incorporate elements from nature into their visual identity. This trivia question tests your knowledge of logo design history in the environmental and natural products sector. Can you identify which famous nature-focused logo has remained essentially unchanged for the longest period?

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World Wildlife Fund (WWF) panda logo, designed by Sir Peter Scott in 1961
The Sierra Club's tree logo, which has been modernized several times since its 1892 founding
National Geographic's yellow rectangle, which was significantly redesigned in 2016
Greenpeace's rainbow and dove symbol, which was completely replaced with a new design in 1998