Answer and explanation:
The sun's core is so hot that there is so much pressure that nuclear fusion takes place. Hydrogen is changed to helium and nuclear fusion creates photons (light) and heat.
To put it in very "simple" terms
more pollution = traps more heat in the atmosphere coming from the sun
more heat = warmer temperatures
warmer temperatures = melting glaciers/ice that would normally stay as ice all year round
melting ice = more water in ocean
more water= higher sea level
higher sea level = flooding in coastal areas
if flooding is high enough, pretty much reduced space on islands and thus extreme crowding or displaced people thus meaning a refugee crisis
