Kees van der Leun

Kees van der Leun has an M.Sc. in physics from Utrecht University. In 1986, he joined Ecofys as its third employee. Ecofys is an international consultancy specialized in energy efficiency, renewable energy, and climate change. At present, he is its COO. He tweets under the handle @Sustainable2050.

Bridging the emissions gap: How to get there from here, in 21 steps

There's a long way to go to cut carbon emissions and bring down long-term temperature projections. Here's a practical plan for getting started, even before the next global treaty kicks in.

Solar PV rapidly becoming the cheapest option to generate electricity

Solar's not getting much love these days. But it could become very cheap, and we can leverage it for a rapid switch to global renewable energy.

How to get to 100 percent renewables globally by 2050

There are many reasons to move to a sustainable energy system: fossil fuel supplies getting tighter, easy oil increasingly having to be replaced by uneasy oil, accelerating climate change. And most indications are that we’ll have to go there as …