Offsetting doesn address the issue of the emissions in the first place! Aren reductions of emissions at source the answer?
We agree completely and the first step, both for individuals and businesses, should be to reduce emissions at source as much as possible. Our reduce your carbon footprint page gives recommended sources of advice for individuals and our reduce your emissions pages gives sources for businesses. However, though offsetting should not be used to escape reductions at source, it should be used alongside them as part of a complete and effective response to reducing CO2 concentrations.