Of course there are exceptions, but in general Americans are much more oriented to the rights of the individual and much less to collectivism and the 'greater good' than Germans. We tend to view collectivism as an inherently oppressive and dictatorial mode of social organization, a cruel enslavement and subjugation of the individual, who is prohibited from doing anything but following the mandates of the collective handed down by some vast inhuman and opaque bureaucracy.
This attitude is less prevalent in more leftist areas such as California and Massachusettes, but I think it's safe to say that it's fairly representative of the average American overall.
I had the reverse experience in Germany: I was amazed at the degree to which many Germans obsess extensively over the minutiae of trivial decisions (such as how far to open the water tap while washing dishes) in terms of what (vanishingly inconsequential in most cases) effect it will speculatively have on the collective good.
Moreover, this seems to be cast in terms of what other people will think of you. Americans care far less about what others will think of them. We tend more towards a philosophy that says if you are not (directly) harming someone else, it's nobody else's business what you do. Germans sort their recycling into 9 seperate bins by color and composition. They could easily put everything in 1 bin and make machines to sort it automatically, or hire someone to do it by hand, but instead it is set up so everyone has to do it themselves -- so your neighbors can see that you are or are not complying with the dictates of society.
Another seperate factor is that natural resources in general are far more abundant in the US than Germany. Relative to the US, Germany is a tiny country with a huge population packed into a very small space.
Meticulously conserving resources is imperative when you have a high population to resource ratio, but less important when you have a huge land area with a very low average population density and so vast amounts of resources available for each person. We are just recently starting to reach the limits of what the natural available resources can support in the US. The local limit in Germany was reached centuries ago, forcing more efficient use of what was available.