If landowners agree to take part in the project , they are then able to sell on the discarded lumber that accumulates during the clearing and ensuing maintenance process at a profit . One of Britain 's most critically endangered butterflies is making a comeback . The Common Milkweed Butterfly (CMB), which was once found only in the UK, has been spotted for the first time since it disappeared from the country more than 30 years ago. The project generates cash and could be replicated to save other endangered butterflies , say Butterfly Conservation .
One of Britain 's most critically endangered butterflies is making a comeback . The Common Milkweed Butterfly (CMB), which was once found only in the UK, has been spotted for the first time since it disappeared from the country more than 30 years ago. The project generates cash and could be replicated to save other endangered butterflies , say Butterfly Conservation .