1 To estimate aggregate enabled emissions reductions, we first estimated reductions for five products individually (Google Earth Pro, Solar API, Nest thermostats, fuel-efficient routing, and Green Light) and then combined the totals. For Solar API, we used the enabled emissions reductions following the annual (rather than lifetime) accounting basis. For details about the individual calculation methodologies, refer to our 2025 Environmental Report.
2Greenhouse Gas Equivalencies Calculator,” U.S. Environmental Protection Agency, November 2024, accessed June 2025.
3 According to Our World in Data.
4 Estimated energy savings are calculated based on the average percentages for heating and cooling savings found in real-world studies of the Nest Learning Thermostat in the U.S. and U.K., and generalized for Nest thermostat usage worldwide, assuming user opt-in for available energy-saving features. To calculate the total Nest savings, we applied the savings percentages to the actual heating and cooling hours of all Nest thermostats in use since 2011. As of January 2023, we use an updated energy savings calculation methodology to account for changes in common HVAC sizes and efficiencies, applying the respective energy savings percentages to Nest thermostats in North America and in European countries.
5 According to the IEA’s Energy Statistics Data Browser, Poland’s total electricity consumption was 159.8 TWh in 2023.
up arrow icon svg