Despite huge investments in clean - energy technologies, such as wind and solar power, “the average unit of energy produced today is basically as dirty as it was 20 years ago, ” says Maria van der Hoeven, executive director of the International Energy Agency.
تُستَثمر اموال طائلة في مجال تكنولوجيا الطاقة النظيفة ،‏ كطاقة الرياح والطاقة الشمسية .‏