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1. Are the balloons biodegradable?

2. Where does the gas end up and does it cause global warming?

3. What about using balloon valves?

4. Shall we tie ribbons onto the balloons?

1. Yes they are
2. It reaches the upper atmosphere and diffuses out into space. Helium is not a greenhouse gas.
3. Valves are not biodegradable -do not use.
4. Ribbons can cause suffering to animals - do not use.