The increasing urgency of the climate crisis requires everybody to act now and change the way we produce and consume. Metrics and tools such as CIBSE's TM66 can now provide a valuable route map for lighting professionals. Since the start of the last century, unregulated human activities have contributed to the emission of large amounts of greenhouse gases (GHGs) into the atmosphere. These can absorb radiation, with the result of making the Earth's surface warmer ('Global Warming Phenomenon', GWP).
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