Already in 1990 the German Government decided, as its contribution to the limitation of worldwide greenhouse gas emissions, to reduce ⁠CO2⁠ emissions by 25% by 2005 – base year 1990 – and to limit or reduce other greenhouse gases. In order to achieve its national climate protection goal, the Government developed a national climate protection strategy and a comprehensive package of measures that meanwhile includes around 150 individual measures. To achieve the reduction goal, the potential of CO2-free renewable energy sources is also being discussed. The objective is the  doubling of the share of renewable energy in primary energy consumption by 2010, as well as a longterm increase to a share of at least 50% by 2050.