Recent content by Dug

As a biologist who has spent a 40+ year career in food production technology development - when I think sustainability, I look for natural limits to sustainability. Resources limit most natural populations, usually by food, or nutrient, or both. Before the industrial revolution the human...

Sea level rise currently is about 1-3 mm per year and is one of those embarrassing little "loose ends" that no one in the climate community wants to talk about. There seems there is a nearly 100% difference between tidal gauge measurements and satellite based measurements in sea level in recent...

So basically, to be sustainable, we would need an energy source beaming down to us from outer space. I'll work on it. That is the exact point. Solar does just that - beams down from space. Relatedly we get tide, wind, and wave - all off planet energy sources available to us in forms that...

Until you critically define "sustainability" you can't get an estimate. However, basic biomass and or life cycle analysis calculations can give us some rough estimates if we define productivity of the respective natural system. In my work we have found that max. biomass for natural systems is...

First you should be aware that 85% of people that graduate from college - work outside of their major (undergraduate level). I went through the same quandary you are experiencing. I suggest you get your first two years of college out of the way out of the way. At this level it won't matter much...