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Even if splitting humanity between two planets might split our "caring per planet", which is possible in some sense - people raised on mars might care very little about earth's ecology - currently a human produces a carbon footprint and pollution a lot more then it produces "care for the planet", in fact almost all of that care - when it's around at all - expresses itself by slightly reducing the disregard and reduce their harm. You would benefit earth more by splitting the harm and sending some of the population there then you would hurt it by splitting the care.
If you mean that people who will still live on earth would otherwise recycle and support any pollution policies or buy less ecologically problematic products, will all of a sudden be ok with it because "Hey it's not like our entire species is in danger, its just our planet"... I think that's seriously underestimating how petty humans are. Can you think of an instance where that's true today in regards to countries, or cities, or... Anything? I work in the call & dispatch center for my city hall, and so far my experience is that most people can't deal with another neighborhood having a slightly geener park.
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