In letters to the Ministry of Defence (MoD) and Department of Trade and Industry, the Royal Society has raised concerns over the number of wind farm pre-applications opposed by the MoD on grounds of interference with air defence radars. According to figures from the British Wind Energy Association, the MoD objected to 48 per cent of pre-applications to build land-based wind farms in 2003, and 34 per cent of pre-applications in 2002.