I will move on in our discussion of resources we've finished with the perpetual resources now we're going to start on the potentially renewable resources a lot of times I will remember to talk about potentially I'll just call them renewable these resources include things like clear freshwater fertile soil plants animals include natural biodiversity the ecosystems that we depend on along with of course the plants now animals that we cultivate for our own use these are resources which in the natural course of events we would expect nature to replace replenish keep them coming but if we mess them up we can damage them to the point that they don't renew themselves anymore through destruction damage overconsumption the main most important issues are discussed with these resources some of the many important ways in which we are causing damage that we will use this anchor slide and we'll go through each of these issues in turn so this this picture here will keep coming back this picture is not in your textbook hasn't been for many many many years Miller alludes in a rather brief fashion to these ideas using a little cartoon in Chapter one that has a picture of a hillside half green and half denuded in brown some ocean with a fishing boat in the foreground and a smoky city in the background it has a few of these phrases Miller does of course cover all of these items in detail in different chapters scattered through the textbook and each of these is a line item on your reading list where those chapters are referenced so that you know where to look for information so let's start at the beginning number one urbanization of productive land little cartoon here makes the point very clearly over on the left here you see green landscape food being grown in the middle here you see bulldozers at work and on the right the city springing up what is this city like this looked like well how about Long Beach this picture came out of the press-telegram some years ago this is Ocean Boulevard on the very bottom here we're looking north across downtown you would see the mountains in the distance only it's kind of smoky let's see those flat roofs there are the old third Street downtown shopping mall the concrete in the distance there is the airport so our la sea campus is about here and the PCC campus is somewhere off the screen here as you look at this can you see any anyway no you can't can you see anything green no well there are a few palm trees sticking out through holes in the concrete here and there that remarkable so this huge well much more that's just like it does not support any kind of ecosystem does not support wildlife doesn't provide resources it's just somewhere for people to live total environmental destruction and while we got this here another thing we already mentioned groundwater how does water get into the ground to become groundwater it soaks in from the rain can you envisage water soaking into the ground anywhere in this scene you can't can you between streets parking lots sidewalks roofs of buildings we've pretty much sealed off the entire surface of the earth from the atmosphere any rain that falls here runs down the streets into the gutters goes down into the storm drains which dump it straight into the ocean where it mixes with salt water and ceases to be a freshwater resource so there's something a little bit absurd here as the city gets bigger we need more and more water and by constructing the city we ensure that we get less and less oops