To dream about your ex-boyfriend/girlfriend or ex-husband/wife, that you and your ex are kissing/fighting or that you and your ex got back together again suggests that something or someone in your current life is bringing out similar feelings you felt during that relationship with your ex. The dream may be a way of alerting you to similar behavioral patterns in your current relationship. What you learn from that previous relationship may need to be applied to the present one so that you do no repeat the same mistakes.
In particular, to see your ex-husband/wife in your dream indicates that you are currently finding yourself in a situation that you do not want to be in. It suggests that you are experiencing a similar relationship or situation which makes you feel unhappy and uncomfortable. Alternatively, dreaming that you are together with your ex-husband/wife implies that you are subconsciously repeating the same old patterns from that relationship to your current relationship. You are making the same mistakes and reacting the same way.
To dream about environmental issues represent the important role you play in the overall big picture. Do not underestimate yourself and your abilities. Alternatively, it signifies a sense of powerlessness. You are feeling overwhelmed by things that are out of your control.