The correct answer is release from proactive interference.
There are two phenomena that can explain forgetfulness: retroactive and proactive interference. The retroactive happens when we have information saved and, later, we receive new, more relevant information. In this case, the nervous system gives priority to the second. Proactive interference is the opposite phenomenon
Proactive interference occurs when old memories hinder the formation of new memories.
This is possible because the data which we have for global warming can be interpreted in multiple possible ways. While the most often interpretation - which also seems to be true given the changes in the environment that have been happening and general observations that can be made - is also the correct one. The people who disagree with this view, most likely interpret the data in a wrong way.
