clean air is dependent on the value you expect to get so you'll part with your money

The worldwide conservation ethic can only be had through the market
penetration of products that promote value to consumers. In order that
the market be ready so that companies can profit by a situation in which
there is real or perceived consumer need for conservation energy pricing
must increase. Pricing will be influenced in one of two ways. Either a
real shortage of energy supply will exist resulting in price
fluctuations outside even the most tumultuous historical averages or
government will be forced to reduce subsidies to force pricing to scale
higher against a ready and "cheap" supply so that conservation becomes a
consumer and corporate target.