Climate research happens to be a good investment IMO. Poster "Wage Slave" has the best short answer as far as I can see so far, but most people don't understand that climate research happens on Navy ships, whether they are docked or underway (at sea). The rest of the other military service branches do this all of the time also. There's much more than $4 billion being invested in military equipment and Government documentation for climate change research than most people understand.
Navy ships take temperature readings of sea water every hour on the hour. They call it "sea water injection temperature". They also track surface air temperature, wind direction, ocean current, relative humidity, atmospheric pressure, and they do it very frequently (at least every hour). They do it as they continue towards their destination (port of calls). Sometimes their mission is to do climate research in the Arctic and Antarctic. EVERY SHIP does every measurement on an hourly basis. It seems that the details of this information is classified, but they do take measurements of every weather related issue on every hour.
Most people ("Climate Clown" environmentalists, especially) do not understand how important our military is to climate research, but there is much more to it. I don't think an EXTRA $4 billion per year is much to ask in order to help our military do its job and to help us all understand our climate better.
Military Climate Research is easily politicized by POTUS. Obama had no clue, but surely imposed his own bias on the research, because he was a "climate clown" himself. I don't object to science doing research through Government, but I don't appreciate politicization of climate research.