We, the older generations, simply cannot leave a world for you, the younger generations, in which climate change impacts become ever more threatening to your survival. Still more public attention and action are needed. Solutions like renewable energy or energy efficiency need to fully power our collective future!

It is critical that the world captures every last bit of energy efficiency, if we are to reduce greenhouse gas emissions enough to keep below dangerous rises in temperature. I am pleased that this important new study shows how information and communication technology can play an essential role in saving energy. Now we need more and effective government policies that reward such action and penalize delayed responses.

No architect should design buildings that import a huge amount of energy.

In a perfect world global emissions would have peaked already. In a semi-perfect world we will peak on Dec. 31, 2020. The fact is, that's going to be difficult. We know that it's going to get more and more expensive the longer we delay.

We are just about to cross the 400 parts per million threshold.

The record-breaking extreme weather events causing chaos across the globe should be a wake-up call. The transition to a low-carbon economy will be much more painful if we wait until there is a climate crisis before recognising that more than half of the world's fossil fuel reserves will have to remain in the ground.

When you have a vision of where you need to go, it sounds utopian. But when you get to the tipping point, your understanding switches.