I'm an anthropocentric communist and see the progress, as in improvement and development, of human society and human living standards as the single most important issue worth fighting for in this world. In my opinion we should let nothing get in it's way.
I refuse to tolerate that people, human beings, remain in unnecessary misery anywhere on earth because someone elses morals, ethics or religion. All such are completely secondary and irrelevant to me when the wellbeing and improvement of our species is in question. Progress of society, science and technology on a global level is crucial if we are to achieve the highest of goals as I see it: maximal wellbeing, minimal suffering and continued development of mankind.
Whether it's achievement requires the destruction of another species, the alteration of the planet into unrecogniseable, nothing really matters as long as the human species thrives and progresses, living standards and life expectancy are elevated, and obsolete and opressive social models are banished from the face of the earth.
I duly hope that this position of mine isn't interpreted as ignorance about the environment, because it's actually quite far from that. I see sustainable development as absolutely crucial, because I recognise the danger pollution, overexploitation and waste of resources poses for human survival on this planet. The human species has become incredibly powerful, as has our potential inpact on the environment. Extreme caution and carefulness is required as we develop further from this point -- or we might destroy all life on earth, and thus ourselves.
Incidentally, as I see it, it being a huge environmental threat is one of the main reasons we must overthrow the capitalist system as soon as possible -- the survival of mankind might depend on it in a not too distant future.