The Past Was Still A

The United States Has Long Thought Of Itself As The Land Of Infinite Plenty, And Historically We Did Have Abundant Resources. But Now We Are Gradually Exhausting Our Fisheries, Our Topsoil, Our Water. On Top Of That, We're Coming To The End Of World Resources.

In Contrast [to Trees And Fish], Oil, Metals, And Coal Are Not Renewable; They Don't Reproduce, Sprout, Or Have Sex To Produce Baby Oil Droplets Or Coal Nuggets.

I've Always Been Interested In A Lot Of Things, And A Lot Of Things At The Same Time, And I Always Tried To Explain Them To Myself. I Ask A Lot Of Questions.

Not Until The Beginning Of The 20th Century Did Europe's Urban Populations Finally Become Self-sustaining: Before Then, Constant Immigration Of Healthy Peasants From The Countryside Was Necessary To Make Up For The Constant Deaths Of City Dwellers From Crowd Diseases.

Technology Has To Be Invented Or Adopted.