Paris (AFP) – Sixty percent of cactus species will wind up in less hospitable climates over the coming decades as global warming sets in, according to new research challenging the long-held assumption the iconic desert plants will thrive with more heat. By 2070, up to 90 percent could be threatened with extinction due to climate change, habitat loss and other stressors, triple the current percentage, scientists reported in Nature Plants. Some 1,500 species of cacti spread across the Americas live in varying climes, ranging from sea-level deserts to the high Andes mountains, from bone-dry ecosy…