By Heidi Harley

science / science - 5 years ago

Environmental groups air doubts about North American trade deal

Campaign groups from Greenpeace to the Sierra Club on Monday slammed the new US-Mexican-Canadian trade deal for its weak provisions on environmental issues. President Donald Trump -- who had repeatedly pledged to overhaul what he called an unfair North American Free Trade Agreement -- said the reto...

science / science - 5 years ago

Why astronauts might not have the stomach for a mission to Mars

Space radiation would be likely to kill or severely weaken astronauts long before they reached Mars, a study by Nasa suggests. New research has found that the assault on space travellers’ intestines would form at least as big an obstacle to reaching the red planet as the technological challenge. The...