Ed Norton has delighted audiences on the silver screen for more than two decades. His roles in films like Fight Club, The Incredible Hulk, Frida, and Primal Fear – for which he was nominated for an Academy Award – have distinguished him as one of Hollywood’s most talented and versatile actors.

Now, he’s turning his attention to another sphere – development and conservation. In July this year he was named a United Nations Goodwill Ambassador for Biodiversity. In that role Ed Norton has been working to ensure world leaders take appropriate measures to protect the environment.

One of his top priorities as Goodwill Ambassador will be to increase “people’s focus on the fact that human well-being is intertwined fundamentally with biodiversity.”

At the ongoing UN General Assembly Conference, the biodiversity crisis will be an issue the 192-member body will focus on.

What would you like to ask Ed Norton about this issue? What would you like to ask him about his acting work, and why he’s taking up biodiversity as a cause now?

Send in your questions below – we'll put them to him in our interview.

[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/02/08/geldof.blog.jpg caption ="Bob Geldof is promoting One Young World in London."]

As world leaders gather at the United Nations to discuss ending world poverty, one music icon is adding his voice to the chorus demanding that more be done.

Irish singer Bob Geldof rose to fame with rock group The Boomtown Rats during the late 1970s, but it was his humanitarian and anti-poverty activism around the world that made him a household name.

Geldof co-wrote the 1984 international hit “Do They Know It’s Christmas,” bringing together some of the biggest names in pop music at the time to raise money for Ethiopia, which was in the grip of a famine. A year later, he organized "Live Aid," one of the largest charity concerts in history.

Twenty years later, Geldof put on the "Live 8" concerts in cities around the world to help draw attention to poverty in Africa and to galvanize world leaders to increase levels of aid to the continent.

This week finds Geldof at the U.N., where heads of state are discussing the Millennium Development Goals. Agreed upon a decade ago, signatories have set out to meet eight targets by 2015. They include halving extreme poverty and hunger, promoting gender equality and empowering women, and beginning to reverse the spread of HIV.

But with just five years to go, many of the Millennium Development Goals are not even on target to completion, much less met. Making matters worse, many donor countries are tightening purse-strings in the wake of large fiscal deficits, rising debts and the global economic crisis.

That’s where Geldof comes in. He brings to the conference a message that all nations – rich and poor – must do more if these goals are going to be met.

Geldof also co-founded the One Organization which aims to fight against extreme poverty.

Here's your chance to ask Bob Geldof a question about the Millennium Development Goals. What do you think needs to be done? What are the priorities where you live? What would you say, given the chance to address the U.N.?

Please leave your questions below.

Goodluck Jonathan is currently the president of the Nigeria - one of Africa's most powerful and influential countries in the region.

[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2010/images/09/21/goodluck.art.gi.jpg
caption="What do you want to ask Goodluck Jonathan?"]

Jonathan has been president of the country with nearly 160 million since 2010 - before that, Jonathan was vice-president of Nigeria.

Earlier in the month, Jonathan officially declared that he will run in the 2011 elections, lauding his achievements in reforming the oil, banking and electricity sectors.

"I have decided to humbly offer myself as a candidate in the presidential primaries of our party the great PDP (People's Democratic Party)," he said.

Jonathan's official declaration comes three days after he informally announced on Facebook that he intended to run in the primaries, which will be held between October 18 and 20, according PDP spokesman Rufai Alkali.

"In presenting myself for service, I make no pretense that I have a magic wand that will solve all of Nigeria's problems or that I am the most intelligent Nigerian," Jonathan wrote on his Facebook page Wednesday.

Jonathan - who is from the Niger Delta, in the south - was part of the joint ticket of the late President Umaru Yar'Adua, who was from the north.

Yar'Adua's death in May, after a long illness, upset the order of the zoning. Yar'Adua was elected in 2007 and his southern replacement threatened to halt the north's turn at holding power.

Here is your chance to quiz Nigerian president Goodluck Jonathan.

Please leave your questions below and be sure to include where you're writing from.