Summer can be dangerous. That’s how Nissan opens its spiel for its newest Intelligent Safety Shield Technology. People have been known to collapse from the heat and food can spoil and ice can melt inside cars’ back seats when left forgotten. While there’s little technology can do with the former, Nissan’s engineers have plenty to say about the latter. That is why the car maker will be rolling out its new Rear Door Alert system to the Pathfinder next month to make sure you leave nothing or no one behind.