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</html><description>What is Global Warming? Why is it warm in a greenhouse on a cool day? The answer is Ultra Violet (UN.). U.V. radiation penetrates the clouds with its medium frequency radiation waves. It can penetrate glass or perspex. Only when the U.V. hits an object, such as a flowerpot in a greenhouse does it turn [&hellip;]</description><thumbnail_url>https://agsrefrigeration.co.uk/blog/wp-content/uploads/2026/02/front-imae-1.png</thumbnail_url><thumbnail_width>312</thumbnail_width><thumbnail_height>242</thumbnail_height></oembed>
