"The impact of cooling on climate change is twofold," explains Fionnuala Walravens, a campaigner at the Environmental Investigation Agency. "Yes, we have the energy used by your cooling system, but one of the often-forgotten sides of cooling is the fact that ironically, cooling products are powered by very potent greenhouse gases called HFCs. These gases often leak out of air conditioners or general cooling products during use, but also at the end of their life. And they have a huge impact on the climate."