Scientists have high confidence that global temperatures have risen and will continue to rise for decades to come, largely due to greenhouse gases produced by human activities. The IPCC predicts that increases in global mean temperature of less than 1 to 3 degrees Celsius above 1990 levels will produce beneficial impacts in some regions and harmful ones in others.
"Taken as a whole," the IPCC states, "the range of published evidence indicates that the net damage costs of climate change are likely to be significant and to increase over time."
Long term temperature changes over 400,000 years. The 10 hottest years on record all occurred since 1998, with 2017 being the hottest to date.
NASA's record of global distribution of temperature range over the last century - click on the image to go to NASA's Climate Time Machine.
Of course there are always people who see things differently.