a venture into science(part 2)

The prevailing explanation for the gradual increase in world-wide temperatures is that there is an increasing amount of hydrocarbons(CO2) in the atmosphere.Yet studies have shown that there is not a steady trend upwards in hydrocarbons in the atmosphere. In addition there have been more hydrocarbons measured in the atmosphere at other times yet the temperature did not increase beyond today's average temterature. There does not seem to be a strong and steady correlation between the amount of hydrocarbons in the atmosphere and the increase in temperature.Perhaps there are other factors to explain the increase in temperature.For example,the earth may not be in a steady orbit and may be gradually moving closer to the sun.However if this is true may it change it's rotation and move (for awhile) away again from it's present orbit and move further away from the sun.Perhaps.