The ethanol-powered gasoline which is globally supported for the environmental improvements reduces the harmful emissions and thereby reduces the gee house gas effects. About 10 % of the gasoline provides about 1% of the energy in the calorific values.
A convenience sample is used. The sample could be biased because it limits the population to listeners of that radio station at a certain time. Callers may be more likely to have a strong opinion on the issue.
