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The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth’s surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at …
The horizon or skyline is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth’s surface, and those that do not. At many locations, the true horizon is obscured by trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the visible horizon. When looking at …
The UN demands urgent action on biodiversity. Sustainable hydropower can be part of the solution, writes Alain Kilajian of the International Hydropower Association (IHA). Today, the United Nations is holding a summit on biodiversity under the theme ‘Urgent Action on Biodiversity for Sustainable Development’. With keynote speeches from heads of state including China’s President Xi …