• Price pressure

    01 February 2009

    America's progression towards mandatory carbon emissions trading looks set to continue to support prices in its voluntary carbon market – but things look bleaker elsewhere, finds Thomas Marcello

  • Counting the cost of offsetting

    01 February 2009

    Times are tough, but offsetting emissions can still make economic as well as environmental sense. Bill Burtis explains how organisations should approach offsetting

  • When is a REC not an offset?

    01 February 2009

    Renewable energy certificates (RECs, green tags or green certificates) represent the quantified non-emissions of a clean form of energy – as measured by how many tonnes of a regulated pollutant would have been emitted in creating that energy from a non-clean form. Those non-emissions are called 'environmental attributes'.