A tool, typically available on line, that allows an organisation to automatically work out their carbon footprint by in-putting related data such as energy used or distance traveled.
Commonly available from airlines and carbon offset firms, which use them to calculate how many offset credits customers should buy.
As with all forms of carbon emission accounting, there have been complaints that there is no universal standard that carbon calculators use to work out emissions.
Tesla chief Elon Musk also reveals he has lined up Silver Lake and Goldman Sachs as financial advisers for the potential move
Fossil fuel's share of Britain's energy mix dipped below one per cent for the first time this summer, according to energy giant
London Assembly call for bins to be placed in men's toilets so items that could cause blockages are not flushed away
Deal sees Macquarie-owned Green Investment Group acquire pipeline of solar projects across Asia Pacific and take on 88 Conergy employees