Hi there,
For an art project I want to be able to read data in real time, and make my Arduino react accordingly.
Say for instance: if the population of Tokyo rises above a certain number, a LED will turn on. Or if the temperature of Paris falls within a certain range, a motor will twist once.
How do I get started with this? How do I read data, and where can I find this data? And can I upload data to the IoT myself?
Thanks in advance!
Presuming the connection to the Internet or "cloud" will be WiFi, you start with an ESP such as a WeMOS D1 Mini, not an Arduino as such. 
You can use Arduino Opla IoT kit. It has everything you need to create an excellent and compact IOT project. It has built-in sensors, LEDs, Motor connection port, you just have to get a motor to connect to it to have your project ready.
It is also very easy to program. Take a look at https://opla.arduino.cc/
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