Predicting the future is not "science", even though the people making the predictions might have scientific credentials.
The models that the so-called "climate scientists" create are based on curve fitting techniques which attempt to correlate observed data with a hypothesized cause/effect relationship with other observed data.
"Global Warming" = aX +bY +cZ
The scientists use the historical data to find the values of the coefficients a,b,c and then predict the magnitude that a change in X,Y,Z will have on "Global Warming". These models have led to all sorts of predictions that have been proven false. The scientists are constantly adjusting their models as new observations are accumulated. They also massage the historical data to fit the models in order to suggest that the model would have had predictive value in the past "If we massage the data accumulated before year 2000 and apply our model, it correctly predicts climate observations made between 2001 and 2015" etc.
These are the exact same mathematical techniques that economists use to make predictions about how something like GDP would be affected by tax policy, government spending, infrastructure spending, oil prices, etc. etc. Very few people would suggest that economists are doing "science".