We can cut emissions in half by 2040 if we build smarter cities

© vincentstthomas – [[www.123rf.com 123RF.com]]</span>As a planet, we have some serious climate targets to meet in the coming years. The Paris Agreement, signed by 192 countries, set an aspirational goal of limiting global warming to 1.5?C. The United Nations Sustainable Development Goals, set to be achieved by 2030, commit the world to "take urgent action" on climate change.