Researchers call for a $150 million, five-year effort to save the monarch butterfly from habitat loss.

Researchers urge Canada, the United States, and Mexico to act quickly to save the monarch butterfly, whose population has dropped by about 80% in the last two decades due to habitat loss. A coordinated effort and a $150 million investment over five years are proposed to restore milkweed plants crucial for the butterfly's survival. Current efforts are in place but deemed insufficient for a lasting impact.