From - BBC World News By - Sophie Hardach Edited by - Amal Udawatta Getty Images (Credit: Getty Images) US President Donald Trump says that wind farms harm birds and whales. Scientists weigh wind power's impacts on wildlife against those of oil and gas. Aspen Ellis, a seabird biologist at University of California, Santa Cruz, spent a decade doing field work on remote islands off the coast of the United States. She often lived for months amongst thousands of birds, becoming so immersed in their ways that she even learned to tell which predators were nearby from the birds' calls. But as she added her observations to 40 or 50 years of previous research on these colonies, she noticed a worrying pattern. "Again and again, I just found myself logging the impact of climate change over time," she recalls, from rising sea levels that threatened breeding colonies, to fish moving to cooler areas and leaving seabird chicks starving. "Without addressing this la...