In the great famine of the 1840s, about two million irish were pushed from ireland and pulled to the united states by climate culture jobs religion

The correct anwser would be climate, because the great potato famine is part of the climate, and was a deciding factor as to why they should leave. I hope you find this helpful, and good luck! :P

In the great famine of the 1840s, about two million Irish were pushed from Ireland and pulled to the United States by "Climate"

More Information. - It was the potato famine which led to starvation and the deaths of almost half of the Irish population.

Hope this helps!

Answer (d) the greenhouse effect is primarily caused by car and trucks;