Pretty sure you're a person called Dylan
The main sources are humans which is why it is stated that the global warming is man made. The levels have increased beyond all measure, increasing since the 1950s by a 100 CO2 parts per million, and it keeps increasing by 2ppm on a yearly basis. The statistics from the industrial revolution era are not much different and show how much we've increased the CO2 in modern times.
Answer:
C
Explanation:
because think of submarine sub means under
The unsuitable factors for forming is '' salt,paints,poisnes substances,etc"
The main factors are pollution and green hous gas
