No I would not call it a conspiracy...I'm not even sure it has a name...it's more like a mental condition that effects groups of "experts" that have realized that they have been wrong for so long and are terrified to tell the previously convinced gullible masses that they were wrong...so they continue the charade...(they are too big to admit failure)...if the ignorant masses learn the experts were dead wrong on the weather...who can they believe in?...they all just learned that even journalists are all biased and can't be trusted...what makes the weather experts any different?...when the left hears hooves they think sheep...not zebras...!
There is all kinds of NEW physical evidence almost on a monthly basis that currently indicates the planet is cooling...but there are very few getting paid to expose this and the gullible masses just turn a deaf ear...