A plan to gradually eliminate nuclear power in Belgium is threatening the nation’s fledgling government — an alliance between Liberal, Socialist, and Green parties — before it even takes office. Meanwhile, an internal battle is raging in Germany’s Green Party, with younger members who favor free markets and less regulation railing against older, more leftist leaders who are pushing for much steeper gas taxes and a phaseout of nuclear power. Many prominent Greens are demanding the resignation of Jurgen Tritten, a top party leader who currently serves as Environment Minister.