Answer:
NO, it's not a hoax.
Explanation:
Global warming is not a controversial topic in science, there's high congruence between findings of different fields across the earth sciences concerning this topic. These fields constantly produce research that is consistent with the hypothesis that the surface, the water, and the atmosphere of the planet is warming, in the 2013 Intergovernmental Panel on Climate Change (IPCC) it is stated that the reviewers were 95% confident that anthropogenic climate change was occurring. Looking at peer-reviewed articles in scientific journals, the congruence is even greater, 97.1% research papers carried out between 1991 and 2001 agreed with the idea of anthropogenic climate change, and this consense grows through the years.
Another factors that adds to this congruency a trehe Earth-orbiting satellites and other technological advances that have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. In the graph I anexed you can observe the temperature data showing rapid warming in the past few decades, the latest data going up to 2018. The 10 warmest years in the 139-year record all have occurred since 2005, with the five warmest years being the five most recent years. (Credit NASA's Earth Observatory) In the Nasa's web page you can also find a list of organizations from all around the world that consense this information.
I hope you find this information useful and interesting! Good luck!
