I love the whimsical feel of postcards but I also have to think of the cost to the environment paper presents. There is more to digital media then just the instant gratification aspect . I only buy digital or vintage books for example because I refuse to cause any more harm to our planet then we already do ... I guess if we used recycled , or hemp paper on the postcards it could be sustainable but currently cards are not made that way in most cases. Yes it is unromantic but we are living on a dying world we need to start thinking about everything we can do to save her ...