One obvious way for firms in the power sector to reduce their emissions is to switch the type of energy they use, for example from inefficient coal-fired power stations to efficient gas stations.

BBC: Switching from high to low carbon energy is a challenge

As a result of price movements, movements in prices in the futures markets, we have a move from inefficient methods of using grain like the production of bacon to more efficient methods of use.

FORBES: The Coming Bacon Famine And The Glory Of Speculation In Food