Science shows that life begins at gastrulation. No uncertainty. At that point the embryo behaves under its own direction, which clearly demonstrates all the attributes Aristotle et al that describe a being. Until then, development is merely xeroxing cells, which can even be from two species or can become twins. There is no junk science in Britannica on development. Whether warming is man made is no longer debateable. The effects may be. What Aristotle says about protecting unborn life applies to the poor near the water. Life must be protected. If you want to risk it, move to the beach.