Monarch butterflies: symbol or symptom?
Environmental threats transcend borders and the prime minister is signalling that responses should too. The U.S. committed to building a milkweed corridor for monarchs along interstate highways. Joined up thinking on issues like this is needed.
Biodiversity is a necessity, not a luxury. Monarch butterflies are among 300 Canadian butterfly species, 800 bee species, and a host of moths, flies, and birds that help pollinate crops and flowering plants. Different organisms, less obviously beautiful, contribute to other indispensable ecosystem services. Monarch butterflies have evolved into a symbol of the North American Free Trade Agreement (NAFTA) and their populations have plummeted, writes Jeremy Kerr. Photograph courtesy of Jacopo Werther