What the world would be like 400 years from today

At the rate technology and society is advancing, what the world will look like 400 years from now is almost impossible to answer. However, that doesn't mean we cannot guess. I think that 400 years from now, fossil fuels will no longer be used. I believe that cars and anything else that uses fossil fuels will be outdated and replaced by more environmentally friendly, and maybe cheaper, sources of fuel. 400 years from now, and the years in between, we will see major changes in technology and how we interact with each other. Technology will change for the better. Technology will improve to the point where deadly diseases, infections and viruses can be instantaneously dectected and cured. Communication technology will always be needed. I think that 400 years from now, phones with a landline will be exclusive to offices for group business calling. Society right now is even moving to all cell phones. There's no telling where the world would be like in 400 years, we can only look at how society and technology has progressed through the recent years, and make an educated guess about it