Triggering a global transformation of our energy systems as required by the Paris Agreement does not take the whole world; it can be started by just a small group of countries, according to a new Climate Action Tracker report.

The global rise of renewable energy, which accounted for over half of all new electricity installations in 2015, was a result of strong actions by just a few countries, according to “Faster & Cleaner 2: kickstarting global decarbonization,” released April 20 by the Climate Action Tracker and the ClimateWorks Foundation.

The report based its investigation on the fact that to meet the Paris Agreement’s long-term temperature limit, the global energy system must completely decarbonize by midcentury.

The Climate Action Tracker examined the trends driving decarbonization in three key sectors of the global energy system—power, transportation and buildings—and looked at what can drive rapid transitions in these areas.