Johnson’s Green Plan Shows Just How Far U.K. Is From Net-Zero (1)

Boris Johnson on Wednesday unveiled a sweeping package of measures designed to zero out Britain’s greenhouse gas pollution by mid-century. The announcement shows just how long that road will be.

The prime minister’s 10-point plan covers everything from diesel cars to hydrogen and offshore wind power. It’s one of the biggest package of climate measures set out by a British prime minister—and even won measured praise from Greenpeace as the U.K. seeks to position itself as a global leader on climate change before it co-hosts global talks next year.

But experts said the government will have to more than double ...