The easiest way for capitalism to become more responsible is to dump the assumption that natural resources and services are so abundant they can be considered as infinte. Actuall,, that's not just a problem of capitalism but of all the extractive economic systems humans have tried.
To anyone individual, the world truely is an enormous place and it is difficult to imagine anything 'running out' but a resource that would have served the population of the world of Adam Smith 500 years would be chewed through in just 35 years by today's population. And that is to ignore increased rates of consumption.
As Guy says, our economic system rewards the destruction of the land. The key question is, can we re-write the rules of the economy to reward activities that nourish the future rather than those that destroy it?

The key, as you say, is lack of responsibility. There vast oceans of capital sloshing around with little or no moral guidance (all our pension funds for example). This is the first thing to change. Until this giant pressure from the global funds changes, little else will. Riverford is a beacon of excellence in an ocean of irresponsibility, let's keep pressing for positive change. Thanks Guy.