These are challenging times in building services. In January the EU announced a carbon reduction target of 40 per cent by 2030 against 1990 levels, an increase in energy generated by renewable sources by 27 per cent and an 'indicative' target of improving energy efficiency by 25 per cent by the same year. This April the amendments to Part L of the Building Regulations come into force, requiring a reduction of carbon emissions for non-domestic buildings by nine per cent compared with 2010 standards, ahead of the zero carbon target for new non-domestic buildings by 2019. The Government has also set the UK a carbon reduction target of 80 per cent by 2050. Mark Northcott tackles the challenges we face