Independent (UK): The explorer Pen Hadow is mounting a new expedition to the Arctic to research “climate change’s evil twin’ — the acidification of the oceans caused by emissions of carbon dioxide. Starting next month, his team will face temperatures of minus 75 — when the wind chill factor is included — as well as frostbite, thin ice and polar bears, to sample sea water far out over the sea ice, as well as from a base in Arctic Canada. They will be seeking to measure how far soaring emissions of …