Dynamic changes in the European climate policy are aimed at a drastic reduction of CO2 emissions. The Union’s policy has several social, economic, and political consequences. Therefore, it is subject to assessment from the perspective of the legal order, including the constitutional order of the Member States. Therefore, a question arises as to the compliance of the “Green Deal” policy with the Polish constitution. It can be very troublesome to answer them positively. The EU policy is not only implemented in the interest of the whole world, and its effectiveness is uncertain, if only due to the need for cooperation of the entire international community. An additional challenge may be the quite evident departure from the principle of sustainable development in favor of climate protection. Although the given questions are troublesome, they deserve attention and noticing an apparent collision.