North Jersey: In the wake of the climate change report released this week by the White House, The Record asked David Robinson, the New Jersey state climatologist, about global warming and the threat of more frequent rains and droughts, rising sea levels, and warmer temperatures in the Garden State. Q. The report noted that since 1970, the Northeast has seen average temperatures rise 2 degrees. Has that played out here? Yes. The mean annual temperature for Northern New Jersey was 50.6 degrees …