Baseball players will tell you that a fastball can rise - and elementary physics says it can also, the same way an airplane rises because the teardrop shape of a wing causes air to go over the top faster than below the flatter bottom, 'sucking' it into the air.    Sure, if the baseball is going 200 MPH it can happen.  But they don't.

Polyethylene terephthalate (PET) is the third most common synthetic polymer and accounts for about 18% of world polymer production. It is an aromatic/aliphatic polyester which possesses very practical thermal properties that are not found in the all aliphatic commodity thermoplastics polyethylene or polypropylene: a glass transition temperature (Tg) near 67°C and a melting temperature (Tm) of 265°C.   But like those two, it is derived from fossil fuels: the key aromatic component of PET, terephthalic acid, is derived from petroleum, while ethylene glycol is derived from petroleum or natural gas.