background blue chemtrails cloud morning sky skies sky vapour trail clouds fly high light sky only summer vapour trails advice alert appropriate-behavior appropriate-behaviour avoid be-careful black care careful caution communicating communication concern danger dangerous flammable gas gaseous natural-gas no-ignition outlet potential red risk risks risky safety sign signs stay-clear vapour vapours warned warning warning-sign white authorisation authorised authorization angel cumullus heaven pot skies.riddle chemtrail egypt holidays jet palms tall trail travel trees chem trails dusk England pink streak sunset Sussex below-ground digging digging-dangers pipeline pipes atmosphere cumulus daytime meteorology nature Particles spring water vapour weather aeroplane arrow contrail cupid heart line love plane clothes clothing heat household iron objects old oxide rusty saavem sheet straighten tool tools vapor