Shell wasn't the one who burned the gasoline and produced the CO2, that was you and me
Yes and no. It's true that "we" are burning all of the oil and gas, and are responsible for the demand. But oil companies themselves emit around 15% of all greenhouse gases in the process of producing, transporting and refining oil, before they sell it to us. That's not an insignificant amount, and perhaps there's a lot of room for further improvement. They already stopped practices like flaring off that pesky natural gas that is produced along with oil.
The same goes for the manufacturers of concrete: they emit a lot of CO2 in the process... but only do so to satisfy our need for the stuff.
Mac on the other hand are for coders that havn't [sic] learned linux yet,
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I used Linux and Solaris for many years, but then MacOS X came out and I switched since it's a BSD-ish environment and all normal Unix software compiles and runs just fine on it. I'd much rather focus on actually coding than doing sys-admin stuff. I gladly let Apple take care of that.
It is much easier to suggest solutions when you know nothing about the problem.