NEW DELHI: To mark Earth Hour, IACM, hardware and networking training institute, on Saturday switched off all lights at all its centres in the country between 8-30 p.m. and 9-30 p.m. “Global warming used to be a subject in textbooks and not taken very seriously. We are now realising the harmful affects of global warming. It is important to highlight the urgency of the issue and do something about it,” said IACM director Ravinder Goyal.

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