mahendra singhi, the ceo of the dalmia cement company mahendra singhi, the ceo of the dalmia cement companyent. the challenge which we took was is it possible to bring down co2 emissions from cement and to create an example that cement can be greener also. today, we have the lowest carbon footprint in the global cement world. it has not been easy. emissions from the cement industry contribute to global warming three orfour times more than aviation does. and becoming carbon negative requires a huge investment in cutting—edge technology to remove the remaining carbon dioxide. so why is cement so dangerous for the planet? it is all in the way it is produced. limestone and other materials are heated to temperatures of 1400dc and that process in itself emits carbon dioxide. as does the burning of the fuels to heat the kiln. dalmia aims to reduce those levels first by using renewable fuels to heat the furnaces. here, bamboo is being used as a replacement for coal. bamboo grows rapidly on wasteland that can't be used for much else. different types of waste are also being used as fuel and waste mat