India joins the US and China in refusing to participate in the EU's upcoming greenhouse gas emissions trading scheme, Maastricht bans overseas tourists from its cannabis coffee-shops, the US government cautions travellers to be vigilant after an anti-terrorist strike in Yemen, and more. Here are the stories travellers are buzzing about:

India rejects EU airline emissions plan
Bad news for the European Union's goal to charge foreign airlines for certificates to emit carbon dioxide when using European airports after 1 January, 2012. India announced its opposition to the plan today, joining more than 20 other nations, including the US and China, reports Reuters. Participating in the permits trading scheme would cost non-EU airlines about $3 billion through 2020, according to an aviation group opposed to the plan. No response yet from EU officials.

Maastricht bans some overseas tourists from its cannabis coffee shops
Since Saturday, coffee shops in the Dutch city of Maastricht may only allow customers with Dutch, Belgian or German passports to buy cannabis, reports BBC News. Maastricht is the first city in the Netherlands to ban some foreign visitors from buying cannabis. The city is taking advantage of legal permission granted earlier this year by EU courts to pass such a law. The sale of cannabis is said to be related to crime and traffic problems.

US urges travellers to be vigilant in aftermath of events in Yemen
The US State Department issued a global travel alert this weekend, warning of the chance of anti-American attacks in response to the killing of Anwar al-Awlaki, named by US officials as "chief of external operations" for "a Yemeni branch of terrorist group al Qaeda". The alert recommends that US citizens travelling abroad enrol in its Smart Traveller Enrolment Program (STEP), which delivers updated details on security issues.

Munich celebrates with an alternative to Oktoberfest
Last year, the German city founded an alternative event to the beer festival that brings half-a-million visitors annually. The event, translated as "old Oktoberfest", offers old-fashioned carnival rides, traditional Bavarian music (not limited to oompah bands), and authentic dress, such as lederhosen and dirndls -- free of university-age drunkards, according to Der Spiegel. The event won't take place next year, however; it will take a year off to recover.

The mega re-tweet
We scour Twitter to highlight a standout travel tweet.

"Tweeting with a sleeping kangaroo: (link to photo) #Australia #TNI"

-- @WheresAndrew, Andrew Evans, the always-on-the-road, always digitally connected writer for National Geographic Traveler and just named a finalist in this year's Folio awards for "best online community".

Like "In brief"? Talk with us on Twitter @BBC_Travel or by using the hashtag #bbcinbrief.