Farmer sues German State for failing to meet 2020 climate target Year after year, Heiner Luetke-Schwienhorst sees summers getting hotter. This Brandenburg dairy producer has therefore taken legal action against the German government for failing to take the necessary measures to achieve its target of reducing greenhouse gas emissions by 40% by 2020. It was last summer's drought, which significantly affected his grain harvest, that prompted him to file a complaint with two other farmers and Greenpeace. IMAGES AND SOUNDBITES.