Replace underperforming equipment
The long lifespan of kitchen equipment encourages a use-it-until-it-breaks mentality, but many newer, energy-efficient machines like refrigerators actually pay for themselves over time. Common sense advances in cook wear, like ridged pan bottoms that take greater advantage of surface area, are another simple way to lower energy waste.
Turn off the damn hood
The vents over a stove can use insane amounts of energy, especially if left running during prep or when there's no actual cooking happening. Even a simple feature like a high/low setting can make Mother Earth cry one less tear.