The Chart pictured is a chart of Copenhagen, Denmark recognized as the greenest city on the planet. Copenhagen does a lot for their city to provide greener alternatives, such as bike lanes, rentable electric bikes, limits on emissions and much more doing so much for their environment.
In the chart you see the drop in emission since 2005 all the way up to 2016, noting it doesn’t go to current times, based on the trend it must be a lot lower. The point is that Copenhagen shows that these simple changes do a lot for the environment. If all other countries and cities did so, there would be a great shift in emissions thus a great shift in global warming.