What might be the cause of the hot summer on Earth in 2018? I have a question relating to the hot temperature this summer. There are 3 reasons that I can come up with:


Chemical, greenhouse effect.
Increased solar activity.
Orbital Resonance. The Earth is closer to the Sun, due to gravitational pull from other planets.


Anybody know something about Orbital Resonance? The orbits are affected by one another as they line up? Particularly the larger ones like Jupiter, Neptune and Saturn?
Seen globally, the Earth is 0.75—1.0 degrees warmer than the average. This is what is modelled by warming due to raised levels of greenhouse gases.  

Currently the sun is close to a solar minimum. Perturbations of the Earth's orbit by other planets do not significantly change the level of solar insolation. Also the ENSO is currently close to neutral. The hot temperatures across western Europe and East Asia are a combination of the effects of greenhouse gases, and the random influence of weather.