Shell has been named as the most "environmentally responsible" company in an environmental monitoring group's survey.
More than 20% of FTSE 100 companies taking part in Business in the Environment's fifth annual Index of Corporate Environmental Engagement said they did not measure emissions and 64% set no reduction targets.
Shell, Scottish Power and J Sainsbury emerged as the top three companies from the FTSE 100.
The top three overall were Shell, Scottish Power and British Energy, which all scored more than 90% in the index.
More than 180 companies, including 78 of the FTSE 100, took part in the index and were asked about their performance and strategies on global warming emissions, waste, water consumption, energy and transport.
Of the FTSE 100 companies, 21% did not measure global warming emissions, and that figure increased to 33% of the overall participants.
Only 27 of the 184 businesses surveyed had set global warming emissions reduction targets of 10% or more, BiE said.
It identified the computing, media, leisure, entertainment and hotel sectors as particularly weak at putting environmental responsibility into practice. The best overall scores were among food and drug retailers, gas distributors, electricity and the automobile industry.
The publication of the index came a day after the United Nations Intergovernmental Panel on Climate Change predicted that global warming would cause mass droughts, flooding and famine, threatening large sections of the world's population.