Seeing terms like "post-truth" and "alternative facts" gain traction in the news convinces me that politicians, media workers and readers could benefit from a refresher course in how science helps us understand the world. Reporting on science is difficult at the best of times. Trying to communicate complex ideas and distill entire studies into eye-catching headlines and brief stories can open the door to misinformation and limited understanding.

Since the 1950s, almost everything about work in the developed world has changed dramatically. Rapid technological advances continue to render many jobs obsolete. Globalization has shifted employment to parts of the world with the lowest costs and standards. Most households have gone from one income-earner to at least two. Women have fully integrated into the workforce, albeit often with less-than-equal opportunities, conditions and pay. A lot of our work is unnecessary and often destructive -- depleting resources, destroying ecosystems, polluting air, water and soil, and fuelling climate change.

If you fly over a forest and look down, you'll see every green tree and plant reaching to the heavens to absorb the ultimate energy source: sunlight. What a contrast when you look down on a city or town with its naked roofs, asphalt roads and concrete sidewalks, all ignoring the sun's beneficence! Research shows we might benefit by thinking more like a forest.

Solar roads could be a step in that direction. Roads, sidewalks and parking lots cover massive areas. Using them to generate power means less environmental disturbance, as no new land is needed to house solar power operations.

How much stuff will you give and receive this holiday season? Add it to the growing pile -- the 30-trillion-tonne pile. That's how much technology and goods humans have produced, according to a study by an international team led by England's University of Leicester. It adds up to more than all living matter on the planet, estimated at around four trillion tonnes.