No, writing "are a" in a sentence is not correct because ''are '' is used for plural objects or things such these are boys, footballs are big etc while n the other hand, ''a'' is used for singular objects such as a ball, a boy etc so these two words which are used in separate sentences not in a single sentence with each other. so we can say that we can't write "are a" in a single sentence.
A rise in the temperature and a loss of ice covers in the arctic will lead to the endangering of the species and will also raise the temperature of the oceanic bodies. Thereby the sea levels will also rise due to the impacts and effects of global warming and the climate changes taking place.
