They have discounted the effectof both on the temperature increase over the last century because they either happen over too short a timescale, or they are too weak.
Natural processes involving changes in the Sun could have at least as powerful an effect on global temperature as increased emissions of carbon dioxide (CO2).
But Dr Zheludev has found that a similar effect can be achieved by keeping the temperature stable and using a beam of light to manipulate gallium's metallic nature.
"We do see these big variations in the temperature in the mantle across parts of Antarctica that will have a big effect on the ice sheet, " Wiens said.
The iOS app initially shows just the core temperature, humidity and hours of sunlight in different sections, with its namesake haze effect giving a clue as to whether conditions are trending up or down.