Climate change is a fact, according to nearly all scientists, and they should take a public stand against the deniers. Unfortunately there is a feeling among large sections of the public that "Experts are not to be trusted," with the result that many people will simply ignore the scientists. Nevertheless they should persevere, as the stakes are too high.
Opinions are not facts. Just because someone claims that climate change isn't true doesn't make it the case. Scientists need to make a public stand and come out for the facts. They need to explain it so that the public understands the urgency and my the president do what is right for the world.
The scientific opinion on climate change is the overall judgment among scientists regarding the extent to which global warming is occurring, its causes, and its probable consequences. This scientific opinion is expressed in synthesis reports, by scientific bodies of national or international standing, and by surveys of opinion among climate scientists. In fact, the effects of climate change already are being felt, including rising anomalies in global temperature, sea level rise, ocean acidification, an uptick in the frequency and severity of heatwaves, losses of land ice in Antarctica and Greenland, and changes in the ranges of many plant and animal species.
Scientists need to stand together to improve climate issues. This includes speaking publicly and openly about how wrong the deniers are. With respected, educated people talking openly about climate change, people are more likely to be informed and make informed decisions about what they do in their daily lives that affect the climate, and who they vote for in regards to those who can affect the climate at a political level.