Omghurry Asked: Light Dependent Resistor?

It says in my book that; bright light means the resistance falls and darkness means resistance is at its highest.

Isn't this incorrect as solar powered lights come on at night, which means resistance is low allowing the current to flow.

RJC Asked: Seems Obama has been mentioning coal as a viable fuel, what happened to wind and solar power?

That he was championing and spending our money on?
Why is he not campaigning on them?

LOL Asked: What type of cars will we be driving when oil runs out?

Whether oil runs out in 20 or 100 years, it won't last forever. And while it may never actually run out totally, the price will get to the point where it's only used by governments and very wealthy people. And since I'm a kid, it worries me how transportation will work later in my lifetime.

WI know Brazil already has cars based on 100% ethanol (well technically, 96% ethanol and 4% water). Will we drive cars like this? And if I understand correctly, ethanol comes from corn, so doesn't that make it a renewable energy? No, I'm not one of those people who gets all up in arms about the environment. I do care, just am not bigoted about it. That's what I hope we move towards: renewable energy. While there may be more natural gas, that too will eventually run out. So what do you all think?

Ben Asked: Should I study "Mechanical and Low Carbon Transport"? UK?

I currently have done:
Vehicle Maintenance & Repair, this was a 2 year course which I spent most of my time on physically working on vehicles.
Mechatronics Engineering, this is a 2 year course which I am about to finish soon.

A university near me offers a 4 year course in Mechanical and Low Carbon Transport, this course seems to be the most appropriate field of engineering for me since I have had 2 years experience with qualifications and enjoy working on cars, also I have heard in the UK renewable energy is going to be a big thing meaning low carbon transport (trains/automotive's) is probably also going to get better.

My question is, is this the correct path for me to take? Is low carbon transport going to get better in the UK because of all the renewable stuff going on? Will engineers in this field be in demand?

Thanks.

Matthew Asked: Are there enough materials on earth to create enough solar panels to power the planet?

Let's say we ran out of all other energy sources and solar was our only option, would there be enough metal, etc. to build all the solar panels we need to keep living as we do (I realize there's no solid technology to use solar power for certain things, i.e. airplanes, yet, but let's disregard that for the sake of this question.)

Nikki Asked: What should be invented that runs on solar energy?

Is there anything that hasn't yet been thought up to use solar power.

Ovrldd Asked: Mechanical vs environmental engineering?

So, I want to follow a course with lots of calcs and on which I can help the planet. I heard that mechanical engineering is the most global eng. of all, and I can specify myself into something environmental-related, so I can build some stuff, like renewable energy cars.
On the other hand, some people said that eletronic eng. is better for renewable energies.
And, finally, I have env. eng., which is the most global one, but I heard that it has less calcs. and most of the jobs you get is by being a consultant. The only thing that admires me here are some clever stuff, like using trees to un-polute a river. And is it true that, if I follow env. eng., I CAN'T build renewable energie stuff? only mechanical eng. can build?

So, I want to hear your opinion: which eng. should be the most safe one for me to follow? (P.S.: I heard that chemical eng. is also a good related eng.)