Heathrow Airport in the UK currently uses more energy than the entire west African country of Sierra Leone. Despite Africa accounting for less than 4% of all global greenhouse gas emissions, many of its countries face significant threats from climate change, including increased droughts, floods, heat waves and potential crop failures. Heathrow Airport in the UK currently uses more energy than the entire west African country of Sierra Leone. Despite Africa accounting for less than 4% of all global greenhouse gas emissions, many of its countries face significant threats from climate change, including increased droughts, floods, heat waves and potential crop failures. Environment Phys.org – latest science and technology news stories