main cause

As livestock numbers grow, wild animal populations plummet. In the last 50 years, two-thirds of all wild animal populations have been lost. The main cause is habitat loss, as native forest is felled to grow grass for cattle or corn and soya for livestock.

US honeybee deaths hit record high as scientists scramble to find main cause

Textbooks need to be rewritten: RNA, not DNA, is the main cause of acute sunburn

Scientists Pinpoint Main Cause of Sensory Hypersensitivity in Autism